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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of assumptions used in weighted-average fair value of options granted | The weighted-average fair value of options granted in the years ended December 31, 2017, 2016 and 2015 was $9.07, $7.70 and $15.15, respectively, based on the following assumptions:
| Year Ended December 31,
| 2017 |  | 2016(a) |  | 2015
Volatility | 24% to 25% |  | 26% |  | 25% to 34%
Risk-free rate | 1.7% to 1.8% |  | 1.2% |  | 0.7% to 1.9%
Expected term (Years) | 5 |  | 5 |  | 2 to 7
Dividend Yield | 0% |  | 0% |  | 0%
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(a) | In the year ended December 31, 2016, all stock options granted had uniform terms and were awarded on the same grant date.
Summary of stock option activity | A summary of stock option activity is presented below:
| Shares (in thousands) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2016 | 1,526 |  |  | $ | 37.42 |  |  |  |  |
Granted | 558 |  |  | 37.59 |  |  |  |  |
Exercises | (136 | ) |  | 34.80 |  |  |  |  |
Forfeitures | (278 | ) |  | 40.38 |  |  |  |  |
Outstanding at December 31, 2017 | 1,670 |  |  | $ | 37.20 |  |  | 6.9 |  | $ | 15.0 |
Vested and exercisable at December 31, 2017 | 949 |  |  | $ | 36.23 |  |  | 5.7 |  | $ | 9.4 |
Schedule of options outstanding by exercise prices | The following table summarizes information about options outstanding as of December 31, 2017:
|  |  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Shares (in thousands) |  | Weighted-Average Remaining Contractual Term (Years) |  | Shares (in thousands) |  | Weighted-Average Exercise Price
$25.00 | to | $35.00 | 530 |  |  | 6.3 |  | 380 |  |  | $ | 30.29 |
$35.00 | to | $45.00 | 724 |  |  | 7.5 |  | 366 |  |  | 37.24 |
$45.00+ | 416 |  |  | 6.6 |  | 203 |  |  | 45.53 |
|  |  | 1,670 |  |  | 6.9 |  | 949 |  |  | $ | 36.23 |
Summary of restricted share unit activity | A summary of restricted share unit activity is presented below:
| Shares (in thousands) |  | Weighted Average Fair Value
Outstanding at December 31, 2016 | 528 |  |  | $ | 39.12 |
Granted | 123 |  |  | 38.16 |
Vested | (166 | ) |  | 37.99 |
Forfeited | (56 | ) |  | 40.51 |
Outstanding at December 31, 2017 | 429 |  |  | $ | 39.10 |
Summary of total shareholders return unit activity | A summary of TSR unit activity is presented below.
| Shares (in thousands) |  | Weighted Average Fair Value
Outstanding at December 31, 2016 | 224 |  |  | $ | 38.60 |
Granted | 231 |  |  | 42.24 |
Forfeited | (57 | ) |  | 42.02 |
Outstanding at December 31, 2017 | 398 |  |  | $ | 40.22 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=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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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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