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All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2024.  If the Company's total shareholder return over the three-year period of January 1, 2021 through December 31, 2023 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"On January 4, 2021, the reporting person was granted performance share units for which the performance criteria for the one-year performance period from January 1, 2021 through December 31, 2021 have been satisfied.  All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2024.  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Fifty percent (50%) of such restricted stock units are subject to an additional vesting requirement, such that they will vest on March 6, 2022 so long as the absolute total shareholder return of the common stock for the three-year performance period from January 1, 2019 through December 31, 2021 is not negative."}],"balance_after":812,"derivative":{"underlying":"Common Stock","underlying_shares":812},"source":{"system":"sec-edgar","filing":"0001209191-20-009093","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1776180/000120919120009093/doc4.xml","form_type":"4"}},{"id":3274452,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":24629,"kind":"person","name":"Pearce Bradley A","position":1,"cik":"0001776180","reported_name":"Pearce Bradley A","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Restricted Stock Units","published_at":"2020-02-13T16:34:51.000Z","date":"2020-02-11","kind":"grant","acquired":true,"shares":1667,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units represent the right to receive shares of common stock on a one-for-one basis and may be settled in cash or in shares of common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Represents previously granted performance share units for which the performance criteria for the three-year performance period from January 1, 2017 through December 31, 2019 have been satisfied."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Represents previously granted performance share units for which the performance criteria for the three-year performance period from January 1, 2017 through December 31, 2019 have been satisfied."}],"balance_after":1667,"derivative":{"underlying":"Common Stock","underlying_shares":1667},"source":{"system":"sec-edgar","filing":"0001209191-20-009093","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1776180/000120919120009093/doc4.xml","form_type":"4"}},{"id":3502660,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":24629,"kind":"person","name":"Pearce Bradley A","position":1,"cik":"0001776180","reported_name":"Pearce Bradley A","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2019-06-04T19:11:09.000Z","date":"2019-06-04","kind":"sale","acquired":false,"shares":1000,"price":27.75,"value":27750.0,"ownership":{"direct":true},"balance_after":16476.7059,"source":{"system":"sec-edgar","filing":"0001209191-19-034187","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1776180/000120919119034187/doc4.xml","form_type":"4"}}]}