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The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 15, 2018, based on the Company's performance for the period from January 1, 2015 to December 31, 2017."}],"balance_after":30641,"source":{"system":"sec-edgar","filing":"0001209191-18-011768","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/315293/000120919118011768/doc4.xml","form_type":"4"}},{"id":4075158,"issuer":{"id":2608,"kind":"organization","name":"Aon plc","symbol":"AON"},"owners":[{"id":155346,"kind":"person","name":"Zern John","position":1,"cik":"0001705528","reported_name":"Zern John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO, Aon Global Health"}}],"security":"Class A Ordinary Stock","published_at":"2018-02-06T23:51:07.000Z","date":"2018-02-02","kind":"sale","acquired":false,"shares":14747,"price":147,"value":2167809.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transaction reported was effected pursuant to a trading plan entered into on November 30, 2017 meeting the requirements of Rule 10b5-1."}],"balance_after":12948,"source":{"system":"sec-edgar","filing":"0001209191-18-007990","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/315293/000120919118007990/doc4.xml","form_type":"4"}},{"id":4145366,"issuer":{"id":2608,"kind":"organization","name":"Aon plc","symbol":"AON"},"owners":[{"id":155346,"kind":"person","name":"Zern John","position":1,"cik":"0001705528","reported_name":"Zern John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO, Global Health & Benefits"}}],"security":"Class A Ordinary Shares","published_at":"2017-12-04T22:35:35.000Z","date":"2017-11-30","kind":"sale","acquired":false,"shares":17680,"price":139.79,"value":2471487.2,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is a weighted average price. Shares were sold in a series of transactions within the same trading day at prices ranging from $139.68 to $140.06, inclusive. Full information regarding the number of shares sold at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer."}],"balance_after":27695,"source":{"system":"sec-edgar","filing":"0001179110-17-014844","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/315293/000117911017014844/edgar.xml","form_type":"4"}},{"id":4227090,"issuer":{"id":2608,"kind":"organization","name":"Aon plc","symbol":"AON"},"owners":[{"id":155346,"kind":"person","name":"Zern John","position":1,"cik":"0001705528","reported_name":"Zern John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO, Global Health & Benefits"}}],"security":"Restricted Share Units (Right to Receive)","published_at":"2017-08-23T21:02:38.000Z","date":"2017-08-21","kind":"exercise","acquired":false,"shares":1150,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with UK law, the reporting person agreed to pay the issuer the nominal value of US$0.01 per share issued to the reporting person."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"A restricted share unit award was granted on August 21, 2014 and vests in accordance with the terms of the Aon Stock Incentive Plan as follows: 20% of the award vests on each of the first through fifth anniversaries of the date of the grant."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"A restricted share unit award was granted on August 21, 2014 and vests in accordance with the terms of the Aon Stock Incentive Plan as follows: 20% of the award vests on each of the first through fifth anniversaries of the date of the grant."}],"balance_after":2300,"derivative":{"expiration_date":"2019-08-21","underlying":"Class A Ordinary Shares","underlying_shares":1150},"source":{"system":"sec-edgar","filing":"0001179110-17-011784","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/315293/000117911017011784/edgar.xml","form_type":"4"}},{"id":4227089,"issuer":{"id":2608,"kind":"organization","name":"Aon plc","symbol":"AON"},"owners":[{"id":155346,"kind":"person","name":"Zern John","position":1,"cik":"0001705528","reported_name":"Zern John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO, Global Health & Benefits"}}],"security":"Class A Ordinary Shares","published_at":"2017-08-23T21:02:38.000Z","date":"2017-08-21","kind":"tax_withholding","acquired":false,"shares":526,"price":138.17,"value":72677.42,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Class A ordinary Shares withheld by the issuer for the payment of taxes in connection with the vesting of a restricted share unit."}],"balance_after":45375,"source":{"system":"sec-edgar","filing":"0001179110-17-011784","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/315293/000117911017011784/edgar.xml","form_type":"4"}},{"id":4227088,"issuer":{"id":2608,"kind":"organization","name":"Aon plc","symbol":"AON"},"owners":[{"id":155346,"kind":"person","name":"Zern John","position":1,"cik":"0001705528","reported_name":"Zern John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO, Global Health & Benefits"}}],"security":"Class A Ordinary Shares","published_at":"2017-08-23T21:02:38.000Z","date":"2017-08-21","kind":"exercise","acquired":true,"shares":1150,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Class A Ordinary Shares acquired upon the vesting of a restricted share unit award."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Class A Ordinary Shares acquired upon the vesting of a restricted share unit award."}],"balance_after":45901,"source":{"system":"sec-edgar","filing":"0001179110-17-011784","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/315293/000117911017011784/edgar.xml","form_type":"4"}},{"id":4309297,"issuer":{"id":2608,"kind":"organization","name":"Aon plc","symbol":"AON"},"owners":[{"id":155346,"kind":"person","name":"Zern John","position":1,"cik":"0001705528","reported_name":"Zern John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO, Global Health & Benefits"}}],"security":"Restricted Share Units (Right to Receive)","published_at":"2017-05-23T20:50:11.000Z","date":"2017-05-19","kind":"exercise","acquired":false,"shares":302,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis.  In accordance with UK law, the reporting person agreed to pay the issuer the nominal value of US$0.01 per share issued to the reporting person."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"A restricted share unit award was granted on February 21, 2013 and vests in accordance with the terms of the Aon Stock Incentive Plan as follows: 20% of the award vests on each of the first through fifth anniversaries of the date of the grant."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"A restricted share unit award was granted on February 21, 2013 and vests in accordance with the terms of the Aon Stock Incentive Plan as follows: 20% of the award vests on each of the first through fifth anniversaries of the date of the grant."}],"balance_after":302,"derivative":{"expiration_date":"2018-05-21","underlying":"Class A Ordinary Shares","underlying_shares":302},"source":{"system":"sec-edgar","filing":"0001179110-17-007850","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/315293/000117911017007850/edgar.xml","form_type":"4"}},{"id":4309296,"issuer":{"id":2608,"kind":"organization","name":"Aon plc","symbol":"AON"},"owners":[{"id":155346,"kind":"person","name":"Zern John","position":1,"cik":"0001705528","reported_name":"Zern John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO, Global Health & Benefits"}}],"security":"Class A Ordinary Shares","published_at":"2017-05-23T20:50:11.000Z","date":"2017-05-19","kind":"tax_withholding","acquired":false,"shares":139,"price":127.28,"value":17691.92,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Class A Ordinary Shares withheld by the issuer for the payment of taxes in connection with the vesting of a restricted share unit."}],"balance_after":44751,"source":{"system":"sec-edgar","filing":"0001179110-17-007850","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/315293/000117911017007850/edgar.xml","form_type":"4"}},{"id":4309295,"issuer":{"id":2608,"kind":"organization","name":"Aon plc","symbol":"AON"},"owners":[{"id":155346,"kind":"person","name":"Zern John","position":1,"cik":"0001705528","reported_name":"Zern John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO, Global Health & Benefits"}}],"security":"Class A Ordinary Shares","published_at":"2017-05-23T20:50:11.000Z","date":"2017-05-19","kind":"exercise","acquired":true,"shares":302,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Class A Ordinary Shares acquired upon the vesting of a restricted share unit award."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Class A Ordinary Shares acquired upon the vesting of a restricted share unit award."}],"balance_after":44890,"source":{"system":"sec-edgar","filing":"0001179110-17-007850","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/315293/000117911017007850/edgar.xml","form_type":"4"}}]}