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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 | $ 11.4 | $ 5.6
Capitalized (cost) credit during the period | (3.4) | 2.7
Amortization of capitalized cost during the period | 5.5 | 3.5
Total stock-based compensation expense | 13.5 | 11.8
Stock option awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | 3.6 | 3.2
Restricted stock awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | 2.2 | 2.0
Performance share awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation cost incurred | 2.5 | 2.0
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 | $ 3.1 | $ (3.0)

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