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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | $ 11.7 | $ 5.2 | $ 23.1 | $ 10.8
Capitalized (cost) credit during the period | (5.9) | 0.2 | (9.3) | 2.9
Amortization of capitalized cost (credit) during the period | 8.8 | (3.3) | 14.3 | 0.2
Total stock-based compensation expense | 14.6 | 2.1 | 28.1 | 13.9
Stock option awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | 2.3 | 2.3 | 5.9 | 5.5
Restricted stock awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | 1.7 | 1.8 | 3.9 | 3.8
Performance share awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost incurred | 1.8 | 1.5 | 4.3 | 3.5
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 | $ 5.9 | $ (0.4) | $ 9.0 | $ (3.4)

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