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Equity Awards - Tax windfall (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Additional information regarding share-based payment arrangements |  |  |
Tax windfall related to share-based payment arrangements | $ 4.0 | $ 3.5 | $ 0.6

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