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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | $ 5.3 | $ 6.7 | $ 28.4 | $ 17.5
Capitalized (cost) credit during the period | 0.0 | (1.1) | (9.3) | 1.8
Amortization of capitalized (credit) cost during the period | 0.0 | (0.1) | 14.3 | 0.1
Total stock-based compensation expense | 5.3 | 5.5 | 33.4 | 19.4
Stock option awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | 1.9 | 2.1 | 7.8 | 7.6
Restricted stock awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | 1.7 | 2.0 | 5.6 | 5.8
Performance share awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | 1.7 | 1.7 | 6.0 | 5.2
Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | 0.0 | 0.0 | 0.0 | 1.4
Stock appreciation rights |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | $ 0.0 | $ 0.9 | $ 9.0 | $ (2.5)

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