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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Compensation Expense | Stock-based compensation cost by award type follows:
(in millions) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Stock option awards |  | $ | 2.3 |  |  | $ | 2.3 |  |  | $ | 5.9 |  |  | $ | 5.5 |
Restricted stock awards |  | 1.7 |  |  | 1.8 |  |  | 3.9 |  |  | 3.8 |
Performance share awards |  | 1.8 |  |  | 1.5 |  |  | 4.3 |  |  | 3.5 |
Restricted stock units |  | — |  |  | — |  |  | — |  |  | 1.4 |
Stock appreciation rights |  | 5.9 |  |  | (0.4) |  |  | 9.0 |  |  | (3.4) |
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 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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