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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | $ 9.6 | $ 11.4
Capitalized cost during the period | 0.0 | (3.4)
Amortization of capitalized cost during the period | 0.0 | 5.5
Total stock-based compensation expense | 9.6 | 13.5
Stock option awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | 3.1 | 3.6
Restricted stock awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | 3.3 | 2.2
Performance share awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | 3.2 | 2.5
Stock appreciation rights |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | $ 0.0 | $ 3.1

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