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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] |
Summary of Changes In Stock Options | The following table summarizes the changes in the number of shares of common stock under option for 2017 (shares and aggregate intrinsic value in millions):
|  | Shares |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted Average Remaining Life (years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2016 |  |  | 0.7 |  |  | $ | 20 |  |  |  |  |  |  |  |  |
Exercised |  |  | (0.3 | ) |  | $ | 25 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2017 (a) |  |  | 0.4 |  |  | $ | 16 |  |  |  | 2.4 |  |  | $ | 6.3 |
(a) | All options outstanding are exercisable
Summary of Changes of Restricted Stock and Restricted Stock Units | The following table summarizes the changes in the number of outstanding restricted stock units for 2017 (shares in millions):
|  | Restricted Stock Units |  |  | Weighted-Average Grant Date Fair Value Per Share - |
Outstanding at December 31, 2016 |  |  | 4.3 |  |  | $ | 48 |
Granted |  |  | 2.0 |  |  |  | 47 |
Grant Adjustments (b) |  |  | 0.1 |  |  |  | 39 |
Vested |  |  | (1.4 | ) |  |  | 40 |
Forfeited |  |  | (0.6 | ) |  |  | 48 |
Outstanding at December 31, 2017 |  |  | 4.4 |  |  |  | 50 |
Expected to vest at December 31, 2017 |  |  | 2.1 |  |  |  | 47 |
(b) | Represents the incremental shares issued from the shares originally granted which were dependent upon the achievement of specified performance criteria.
Summary of Total Unrecognized Compensation Cost Related to Stock-based Compensation | The following table summarizes the Company’s total unrecognized compensation cost related to stock-based compensation as of December 31, 2017 (in millions):
|  | Unrecognized Compensation Cost |  |  | Weighted-Average Period of Expense Recognition (in years) |
Restricted stock units |  | $ | 87.9 |  |  |  | 1 |

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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 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 total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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