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Stockholders' Equity Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Nonvested stock rollforward | Activity under the Company’s nonvested stock awards and restricted share units for the years ended December 31, 2017, 2016, and 2015 was as follows:
(Shares in thousands, $ in millions) |  | 2017 |  | 2016 |  | 2015
|  | 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 |  | 1,852 |  |  | $ | 51.5 |  |  | 1,652 |  |  | $ | 57.0 |  |  | 1,376 |  |  | $ | 47.8 |
Granted |  | 378 |  |  | 7.1 |  |  | 682 |  |  | 8.4 |  |  | 669 |  |  | 20.8 |
Vested |  | (640 | ) |  | (18.4 | ) |  | (154 | ) |  | (4.3 | ) |  | (23 | ) |  | (0.8 | )
Forfeited |  | (270 | ) |  | (7.7 | ) |  | (328 | ) |  | (9.6 | ) |  | (370 | ) |  | (10.8 | )
Nonvested, end of year |  | 1,320 |  |  | $ | 32.5 |  |  | 1,852 |  |  | $ | 51.5 |  |  | 1,652 |  |  | $ | 57.0 |
Schedule of Nonvested Performance-based Units Activity [Table Text Block] | Activity under the Company’s PSUs at target for the years ended December 31, 2017 and 2016 was as follows:
(Shares in thousands, $ in millions) |  | 2017 |  | 2016
|  | Number of shares/units |  | Weighted Average Grant Date Fair Value |  | Number of shares/units |  | Weighted Average Grant Date Fair Value
Nonvested, beginning of year |  | 919 |  |  | $ | 11.3 |  |  | — |  |  | $ | — |
Granted |  | 590 |  |  | 12.4 |  |  | 937 |  |  | 11.5 |
Forfeited |  | (68 | ) |  | (1.0 | ) |  | (18 | ) |  | (0.2 | )
Nonvested, end of year |  | 1,441 |  |  | $ | 22.7 |  |  | 919 |  |  | $ | 11.3 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&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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