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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2020
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, |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Stock option awards |  | $ | 2.6 |  |  | $ | 2.5 |  |  | $ | 5.8 |  |  | $ | 5.6 |
Restricted stock awards |  | 1.9 |  |  | 2.1 |  |  | 4.0 |  |  | 4.1 |
Performance share awards |  | 1.7 |  |  | 1.5 |  |  | 3.8 |  |  | 3.1 |
Restricted stock units |  | — |  |  | — |  |  | 1.4 |  |  | 1.3 |
Stock appreciation rights |  | (0.3) |  |  | 2.1 |  |  | (3.9) |  |  | 2.9 |
Total stock-based compensation cost incurred |  | 5.9 |  |  | 8.2 |  |  | 11.1 |  |  | 17.0 |
Capitalized credit (cost) during the period |  | 0.1 |  |  | (2.6) |  |  | 3.4 |  |  | (3.8) |
Amortization of capitalized (credit) cost during the period |  | (3.8) |  |  | 1.7 |  |  | 0.4 |  |  | 2.3 |
Total stock-based compensation expense |  | $ | 2.2 |  |  | $ | 7.3 |  |  | $ | 14.9 |  |  | $ | 15.5 |

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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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