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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 Payment Award, Stock Options, Valuation Assumptions | Principal weighted average assumptions used in applying the Black-Scholes model were as follows:
|  | 2018 Grants |  | 2017 Grants |  | 2016 Grants
Expected Term |  | 6.0 years |  |  | 6.0 years |  |  | 6.0 years |
Volatility |  | 20.27 | % |  | 21.75 | % |  | 21.63 | %
Dividend Yield |  | — |  |  | — |  |  | — |
Discount Rate |  | 2.66 | % |  | 2.03 | % |  | 1.45 | %
Schedule of Stock Options Roll Forward | A summary of stock option award activity as of and for the year ended December 31, 2018 is presented below:
|  | Awards (in millions) |  | Weighted- Average Exercise Price |  | Aggregate Intrinsic Value (in millions) |  | Weighted Average Remaining Contractual Life (years)
Outstanding at December 31, 2017 |  | 8.1 |  |  | $ | 16.54 |  |  |  |  |
Granted |  | 1.1 |  |  | $ | 29.74 |  |  |  |  |
Exercised |  | (1.7 | ) |  | $ | 10.52 |  |  |  |  |
Forfeited |  | (0.3 | ) |  | $ | 29.59 |  |  |  |  |
Outstanding at December 31, 2018 |  | 7.2 |  |  | $ | 19.32 |  |  |  |  |
Vested and expected to vest at December 31, 2018 |  | 7.2 |  |  | $ | 19.32 |  |  | $ | 48.0 |  |  | 5.76
Exercisable at December 31, 2018 |  | 5.6 |  |  | $ | 16.80 |  |  | $ | 48.0 |  |  | 5.08
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of restricted stock and restricted stock unit award activity as of December 31, 2018 is presented below:
|  | Awards (in millions) |  | Weighted-Average Fair Value
Outstanding at December 31, 2017 |  | 1.9 |  |  | $ | 29.32 |
Granted |  | 1.1 |  |  | $ | 29.61 |
Vested |  | (1.2 | ) |  | $ | 29.84 |
Forfeited |  | (0.2 | ) |  | $ | 29.33 |
Outstanding at December 31, 2018 |  | 1.6 |  |  | $ | 29.12 |
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] | A summary of PSA activity as of December 31, 2018 is presented below:
|  | Awards (in millions) |  | Weighted-Average Fair Value
Outstanding at December 31, 2017 |  | 0.6 |  |  | $ | 31.17 |
Granted |  | 0.3 |  |  | $ | 33.81 |
Vested |  | — |  |  | $ | — |
Forfeited |  | (0.1 | ) |  | $ | 33.65 |
Outstanding at December 31, 2018 |  | 0.8 |  |  | $ | 31.82 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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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- Definition Tabular disclosure of the change in stock options. + 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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