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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Stock-based compensation cost by award type follows:
(in millions) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Stock option awards |  | $ | 5.0 |  |  | $ | 2.2 |  |  | $ | 10.1 |  |  | $ | 5.1 |
Restricted stock awards |  | 2.2 |  |  | 1.7 |  |  | 5.4 |  |  | 4.9 |
Performance share awards |  | 3.6 |  |  | 2.1 |  |  | 6.0 |  |  | 5.1 |
Total stock-based compensation cost incurred |  | 10.8 |  |  | 6.0 |  |  | 21.5 |  |  | 15.1 |
Capitalized cost during the period |  | (1.6) |  |  | — |  |  | (3.2) |  |  | — |
Amortization of capitalized cost during the period |  | 1.6 |  |  | — |  |  | 3.5 |  |  | — |
Total stock-based compensation expense |  | $ | 10.8 |  |  | $ | 6.0 |  |  | $ | 21.8 |  |  | $ | 15.1 |

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