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

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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- References No definition available. + Details
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