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Stock Repurchases (Details) - USD ($) shares in Millions |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 19, 2016 | Aug. 01, 2016 | Feb. 10, 2016 | Jul. 18, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2011
Authorized amount for share repurchase |  |  |  |  | $ 550,000,000 |  |  | $ 2,000,000,000
Accelerated Share Repurchases, Initial Price Paid |  | $ 100,000,000 | $ 200,000,000 |  |  |  |  |
Accelerated Share Repurchases, Number | 0.2 | 0.5 | 1.3 | 0.2 |  |  |  |
Accelerated Share Repurchases, Percentages of Shares to be Repurchased |  | 75.00% | 75.00% |  |  |  |  |
Repurchases of common stock |  |  |  |  | $ 300,000,000 | $ 0 | $ 550,300,000 |
Repurchased shares to satisfy minimum withholding obligations (in shares) |  |  |  |  | 0.2 | 0.3 |  |
Repurchased shares to satisfy employee withholding tax obligations |  |  |  |  | $ 33,300,000 | $ 32,000,000 | $ 22,400,000 |

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- Definition Accelerated Share Repurchases, Number + References No definition available. + Details
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- Definition Accelerated Share Repurchases, Percentages of Shares to be Repurchased + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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