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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of the company's stock option activity | A summary of the company’s stock option activity is as follows (in millions, except weighted average exercise price per share):
|  | Shares |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
Options outstanding as of January 1, 2014 |  | 7.0 |  |  | $ | 16.00 |  |  |  |
Granted |  | 0.3 |  |  | 29.08 |  |  |  |
Exercised |  | (1.7 | ) |  | 10.92 |  |  |  |
Cancelled |  | — |  |  | 27.07 |  |  |  |
Options outstanding as of December 31, 2014 |  | 5.6 |  |  | $ | 18.23 |  |  |  |
Granted |  | 0.7 |  |  | 21.02 |  |  |  |
Exercised |  | (0.5 | ) |  | 9.63 |  |  |  |
Cancelled |  | (0.3 | ) |  | 23.70 |  |  |  |
Options outstanding as of December 31, 2015 |  | 5.5 |  |  | $ | 19.04 |  |  | $ | 11.0 |
Options exercisable as of: |  |  |  |  |  |  |  |  |
December 31, 2015 |  | 4.7 |  |  | $ | 18.64 |  |  | $ | 11.0 |
Schedule of the options outstanding and exercisable by range of exercise prices | The following table shows the options outstanding and exercisable by range of exercise prices at December 31, 2015 (in millions, except range of exercise price per share, weighted average remaining contractual life and weighted average exercise price):
|  | Outstanding |  | Weighted Average Remaining Contractual |  | Weighted Average |  | Exercisable |  | Weighted Average
Range of Exercise Price per Share |  | Options |  | Life (Years) |  | Exercise Price |  | Options |  | Exercise Price
$4.41 - $11.34 |  | 0.6 |  |  | 2.6 |  | $ | 4.41 |  |  | 0.6 |  |  | $ | 4.41 |
$11.35 - $16.79 |  | 1.6 |  |  | 3.4 |  | 13.26 |  |  | 1.5 |  |  | 12.88 |
$16.80 - $21.80 |  | 1.6 |  |  | 4.4 |  | 19.82 |  |  | 1.1 |  |  | 19.36 |
$21.81 - $27.03 |  | 0.5 |  |  | 0.3 |  | 26.11 |  |  | 0.5 |  |  | 26.11 |
$27.04- $29.52 |  | 0.7 |  |  | 2.9 |  | 29.34 |  |  | 0.6 |  |  | 29.41 |
$29.53 - $30.47 |  | 0.1 |  |  | 8.2 |  | 30.47 |  |  | — |  |  | 30.47 |
$30.48 - $47.84 |  | 0.4 |  |  | 1.5 |  | 38.87 |  |  | 0.4 |  |  | 38.87 |
|  | 5.5 |  |  | 3.1 |  | $ | 19.04 |  |  | 4.7 |  |  | $ | 18.64 |
Schedule of the assumptions used to estimate the fair value of each option grant | The fair value of each option grant was estimated at the date of grant using the Black-Scholes option-pricing method with the following assumptions:
|  | 2015 |  | 2014 |  | 2013
Expected Life (years) |  | 6.0 |  |  | 6.0 |  |  | 6.0 |
Risk-free Interest rate |  | 1.8 | % |  | 1.9 | % |  | 1.1 | %
Expected volatility |  | 56.0 | % |  | 55.0 | % |  | 56.0 | %
Expected dividend yield |  | 0.3 | % |  | 0.4 | % |  | 0.6 | %
Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of nonvested share activity | A summary of activity for restricted stock awards for the year ended December 31, 2015 is as follows (in millions except weighted average grant date fair value):
|  | Shares |  | Weighted Average Grant Date Fair Value
Unvested as of January 1, 2015 |  | 0.2 |  |  | $ | 16.58 |
Granted |  | 0.4 |  |  | 21.73 |
Vested |  | (0.2 | ) |  | 17.12 |
Cancelled |  | — |  |  | 21.18 |
Unvested as of December 31, 2015 |  | 0.4 |  |  | $ | 21.40 |
Performance shares |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of nonvested share activity | A summary of activity for restricted stock units for the year ended December 31, 2015 is as follows (in millions except weighted average grant date fair value):
|  | Shares |  | Weighted Average Grant Date Fair Value
Unvested as of January 1, 2015 |  | 0.8 |  |  | $ | 27.09 |
Granted |  | 0.6 |  |  | 21.06 |
Vested* |  | (0.4 | ) |  | 20.77 |
Cancelled |  | (0.3 | ) |  | 27.64 |
Unvested as of December 31, 2015 |  | 0.7 |  |  | $ | 25.53 |
* Under the terms of the 2013 performance share award, the actual number of shares awarded could have ranged from zero to 0.8 million, depending on the company’s three-year performance as described above. Based on the performance criteria a total of 0.3 million shares was awarded in 2016.

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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 Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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