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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | The following table summarizes activity relating to our RSUs:
|  |  | Weighted-Average
| Number of |  | Grant Date Fair
| Shares/Units |  | Value per Share/Unit
| (in millions, except per share data)
Outstanding at January 1, 2016 | 1.7 |  |  | $ | 18.19 |
Granted | 0.9 |  |  | 15.41 |
Vested | (0.7 | ) |  | 13.23 |
Canceled | (0.1 | ) |  | 18.75 |
Outstanding at December 31, 2016 | 1.8 |  |  | $ | 18.70 |
Granted | 1.3 |  |  | 18.09 |
Vested | (0.4 | ) |  | 19.70 |
Canceled | (0.2 | ) |  | 16.79 |
Outstanding at December 31, 2017 | 2.5 |  |  | $ | 18.35 |
Granted | 1.7 |  |  | 14.57 |
Vested | (0.4 | ) |  | 24.16 |
Canceled | (0.3 | ) |  | 15.84 |
Outstanding at December 31, 2018 | 3.5 |  |  | $ | 16.00 |
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] | The following table summarizes activity relating to our performance shares:
|  |  | Weighted Average
| Number of |  | Grant Date Fair
| Shares |  | Value per Share
EBITDA Awards | (in millions, except per share data)
Outstanding at January 1, 2016 | 0.3 |  |  | $ | 32.27 |
Granted | 0.2 |  |  | 28.04 |
Vested | — |  |  | — |
Canceled | — |  |  | — |
Outstanding at December 31, 2016 | 0.5 |  |  | $ | 30.19 |
Granted | 0.2 |  |  | 39.01 |
Vested | (0.1 | ) |  | 27.73 |
Canceled | — |  |  | — |
Outstanding at December 31, 2017 | 0.6 |  |  | $ | 33.91 |
Granted | — |  |  | — |
Vested | (0.1 | ) |  | 37.67 |
Canceled | — |  |  | — |
Outstanding at December 31, 2018 | 0.5 |  |  | $ | 34.49 |
TSR Awards |  |  |
Outstanding at January 1, 2016 | 0.3 |  |  | $ | 25.77 |
Granted | 0.2 |  |  | 13.16 |
Vested | — |  |  | — |
Canceled | — |  |  | — |
Outstanding at December 31, 2016 | 0.5 |  |  | $ | 19.55 |
Granted | 0.2 |  |  | 24.58 |
Vested | (0.1 | ) |  | 22.78 |
Canceled | — |  |  | — |
Outstanding at December 31, 2017 | 0.6 |  |  | $ | 20.93 |
Granted | 0.3 |  |  | 13.91 |
Vested | (0.1 | ) |  | 31.21 |
Canceled | — |  |  | — |
Outstanding at December 31, 2018 | 0.8 |  |  | $ | 16.25 |
Free Cash Flow Awards |  |  |
Outstanding at January 1, 2018 | — |  |  | $ | — |
Granted | 0.3 |  |  | 14.28 |
Vested | — |  |  | — |
Canceled | — |  |  | — |
Outstanding at December 31, 2018 | 0.3 |  |  | $ | 14.28 |

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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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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + 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 (c) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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