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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | $ 12.4 | $ 5.2
Capitalized (cost) credit during the period | (4.3) | 3.3
Amortization of capitalized cost during the period | 6.8 | 4.2
Total stock-based compensation expense | 14.9 | 12.7
Stock option awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | 3.8 | 3.2
Restricted stock awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | 2.2 | 2.1
Performance share awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | 2.5 | 2.1
Restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | 0.0 | 1.4
Stock appreciation rights |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | $ 3.9 | $ (3.6)

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