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Stockholders' Equity Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Nonvested stock rollforward | Activity under the Company’s nonvested stock awards and restricted share units for the years ended December 31, 2019, 2018, and 2017 was as follows:
(Shares in thousands, $ in millions) |  | 2019 |  | 2018 |  | 2017
|  | 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 |  | 1,055 |  |  | $ | 28.3 |  |  | 1,320 |  |  | $ | 32.5 |  |  | 1,852 |  |  | $ | 51.5 |
Granted |  | 396 |  |  | 10.8 |  |  | 290 |  |  | 7.8 |  |  | 378 |  |  | 7.1 |
Vested |  | (681 | ) |  | (14.5 | ) |  | (540 | ) |  | (11.7 | ) |  | (591 | ) |  | (16.9 | )
Forfeited |  | (14 | ) |  | (0.4 | ) |  | (15 | ) |  | (0.3 | ) |  | (319 | ) |  | (9.2 | )
Nonvested, end of year |  | 756 |  |  | $ | 24.2 |  |  | 1,055 |  |  | $ | 28.3 |  |  | 1,320 |  |  | $ | 32.5 |

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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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