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v3.20.4

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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