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Stockholders' Equity Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Nonvested stock rollforward | Activity under the Company’s nonvested stock awards and restricted share units for the years ended December 31, 2021, 2020, and 2019 was as follows:
(Shares in thousands, $ in millions) |  | 2021 |  | 2020 |  | 2019
|  | Number of shares/units |  | Weighted Average Grant Date Fair Value |  | Number of shares/units |  | Weighted Average Grant Date Fair Value |  | Number of shares |  | Weighted Average Grant Date Fair Value
Nonvested, beginning of year |  | 929 |  |  | $ | 17.9 |  |  | 756 |  |  | $ | 19.6 |  |  | 1,055 |  |  | $ | 23.7 |
Granted |  | 1,033 |  |  | 17.5 |  |  | 647 |  |  | 10.1 |  |  | 396 |  |  | 10.8 |
Vested |  | (505) |  |  | (8.9) |  |  | (450) |  |  | (11.2) |  |  | (681) |  |  | (14.5) |
Forfeited |  | (48) |  |  | (0.9) |  |  | (24) |  |  | (0.6) |  |  | (14) |  |  | (0.4) |
Nonvested, end of year |  | 1,409 |  |  | $ | 25.6 |  |  | 929 |  |  | $ | 17.9 |  |  | 756 |  |  | $ | 19.6 |
Disclosure of Fair Value of PSU Awards | The estimated fair value of each PSU award, the target share units awarded and projected future compensation expense to be recognized for these awards, including actual and estimated forfeitures at December 31, 2021 was as follows:
(Shares in thousands, $ in millions) |  |  |  |  |  |  |  |
PSU Award Performance Period |  | Award Fair Value |  | December 31, 2021 Unrecognized Compensation Expense |  | Compensation Expense Expected to be Recognized in the next 12 months |  | Target Share Units
2019-2021 |  | $ | 14.7 |  |  | $ | — |  |  | $ | — |  |  | 479 |
2020-2022 |  | $ | 13.5 |  |  | — |  |  | — |  |  | 674 |
2021-2023 |  | $ | 9.3 |  |  | 6.6 |  |  | 3.1 |  |  | 459 |
Total |  |  |  | $ | 6.6 |  |  | $ | 3.1 |  |  |

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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