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Stock-Based Compensation - Key Components of Outperformance Plan (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
2020 PSU Plan | Operational Performance Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum bonus pool	$ 14.9
2020 PSU Plan | Relative TSR Performance Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum bonus pool	$ 14.9
Outperformance Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum bonus pool		$ 28.0	$ 25.0

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- Definition

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