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Stock Based Compensation Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  |  | Weighted-
| Number of |  | Average Exercise
| Shares |  | Price Per Share
| (in millions, except per share data)
Outstanding at January 1, 2013 | 3.0 |  |  | $ | 27.08 |
Options granted | — |  |  | — |
Options exercised | (0.1 | ) |  | 10.59 |
Options canceled | (0.9 | ) |  | 24.28 |
Outstanding at December 31, 2013 | 2.0 |  |  | $ | 29.22 |
Options granted | — |  |  | — |
Options exercised | (0.1 | ) |  | 13.87 |
Options canceled | (1.0 | ) |  | 37.70 |
Outstanding at December 31, 2014 | 0.9 |  |  | $ | 20.66 |
Options granted | — |  |  | — |
Options exercised | (0.1 | ) |  | 17.13 |
Options canceled | (0.2 | ) |  | 26.65 |
Outstanding at December 31, 2015 | 0.6 |  |  | $ | 18.58 |
Exercisable at December 31, 2013 | 2.0 |  |  | $ | 29.22 |
Exercisable at December 31, 2014 | 0.9 |  |  | $ | 20.66 |
Exercisable at December 31, 2015 | 0.6 |  |  | $ | 18.58 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  | Stock Options |  | Weighted- |  | Weighted-
Range of |  | Outstanding and |  | Average Exercise |  | Average
Exercise Prices |  | Exercisable |  | Price Per Share |  | Contractual Life
|  | (in millions, except per share data) |  |  | (in years)
$9.19 - $10.08 |  | 0.2 |  |  | $ | 9.43 |  |  | 2.6
$15.58 - $26.02 |  | 0.4 |  |  | 21.47 |  |  | 0.8
|  | 0.6 |  |  | $ | 18.58 |  |  | 1.2
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  |  | Weighted-Average
| Number of |  | Grant Date Fair
| Shares/Units |  | Value per Share/Unit
| (in millions, except per share data)
Outstanding at January 1, 2013 | 1.1 |  |  | $ | 11.08 |
Granted | 0.9 |  |  | 12.79 |
Vested | (0.7 | ) |  | 11.06 |
Canceled | — |  |  | — |
Outstanding at December 31, 2013 | 1.3 |  |  | $ | 12.24 |
Granted | 0.5 |  |  | 19.58 |
Vested | (0.1 | ) |  | 13.95 |
Canceled | (0.1 | ) |  | 12.76 |
Outstanding at December 31, 2014 | 1.6 |  |  | $ | 14.54 |
Granted | 0.5 |  |  | 25.21 |
Vested | (0.3 | ) |  | 11.03 |
Canceled | (0.1 | ) |  | 19.99 |
Outstanding at December 31, 2015 | 1.7 |  |  | $ | 18.19 |
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, 2014 | — |  |  | $ | — |
Granted | 0.2 |  |  | 27.66 |
Vested | — |  |  | — |
Canceled | — |  |  | — |
Outstanding at December 31, 2014 | 0.2 |  |  | $ | 27.66 |
Granted | 0.1 |  |  | 37.68 |
Vested | — |  |  | — |
Canceled | — |  |  | — |
Outstanding at December 31, 2015 | 0.3 |  |  | $ | 32.27 |
TSR Awards |  |  |
Outstanding at January 1, 2014 | — |  |  | $ | — |
Granted | 0.2 |  |  | 21.11 |
Vested | — |  |  | — |
Canceled | — |  |  | — |
Outstanding at December 31, 2014 | 0.2 |  |  | $ | 21.11 |
Granted | 0.1 |  |  | 31.22 |
Vested | — |  |  | — |
Canceled | — |  |  | — |
Outstanding at December 31, 2015 | 0.3 |  |  | $ | 25.77 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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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