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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | $ 5.6 | $ 5.3 | $ 21.4 | $ 28.4
Capitalized cost during the period | 0.0 | 0.0 | 0.0 | (9.3)
Amortization of capitalized cost during the period | 0.0 | 0.0 | 0.0 | 14.3
Total stock-based compensation expense | 5.6 | 5.3 | 21.4 | 33.4
Stock option awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | 2.3 | 1.9 | 7.7 | 7.8
Restricted stock awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | 1.3 | 1.7 | 6.3 | 5.6
Performance share awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | 2.0 | 1.7 | 7.4 | 6.0
Stock appreciation rights |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | $ 0.0 | $ 0.0 | $ 0.0 | $ 9.0

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