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Equity Incentive Program - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based Payment Arrangement, Expense | $ 7,400,000 | $ 4,100,000 | $ 18,500,000 | $ 7,600,000
SSARs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 0 |  | 0 |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 4,000,000.0 |  | $ 4,000,000.0 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  | 1 year 6 months |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 26,000,000.0 |  | $ 26,000,000.0 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  | 1 year 10 months 24 days |
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 14,300,000 |  | $ 14,300,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  | 1 year 7 months 6 days |
Minimum [Member] | Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Percentage increase of initial grant value |  |  | 0.00% |
Maximum [Member] | Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Percentage increase of initial grant value |  |  | 225.00% |

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