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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 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 March 31, |  |
| 2021 |  | 2020 |  |  |  |
Stock option awards |  | $ | 3.8 |  |  | $ | 3.2 |  |  |  |  |
Restricted stock awards |  | 2.2 |  |  | 2.1 |  |  |  |  |
Performance share awards |  | 2.5 |  |  | 2.1 |  |  |  |  |
Restricted stock units |  | — |  |  | 1.4 |  |  |  |  |
Stock appreciation rights |  | 3.9 |  |  | (3.6) |  |  |  |  |
Total stock-based compensation cost incurred |  | 12.4 |  |  | 5.2 |  |  |  |  |
Capitalized (cost) credit during the period |  | (4.3) |  |  | 3.3 |  |  |  |  |
Amortization of capitalized cost during the period |  | 6.8 |  |  | 4.2 |  |  |  |  |
Total stock-based compensation expense |  | $ | 14.9 |  |  | $ | 12.7 |  |  |  |  |

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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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