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Stockholders' Equity - Repurchase of Common Stock (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Aug. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | May 31, 2017 | Mar. 31, 2017 | Jul. 31, 2015 | Aug. 31, 2007
July 2015 Repurchase Program |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  | $ 1,500,000,000 |
Stock repurchase program, number of shares authorized to be repurchased |  |  |  |  |  |  |  |  |  | 20,000,000
Stock repurchase program, authorized increase |  |  |  |  |  |  |  | $ 1,500,000,000.0 |  |
Number of shares repurchased |  | 1,661,782 | 3,545,828 |  | 5,198,090 | 4,680,313 |  |  |  |
Value of shares repurchased |  | $ 72,400,000 | $ 165,000,000 |  | $ 227,700,000 | $ 217,000,000 |  |  |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 400,000,000 | $ 400,000,000 |  |  | 400,000,000 |  | $ 150,000,000.0 |  |  |
Number of shares repurchased | 7,368,179 |  |  | 2,914,955 |  |  |  |  |  |
Value of shares repurchased |  |  |  |  | $ 320,000,000 |  |  |  |  |
Stock repurchase program, remaining authorization |  |  |  | $ 129,600,000 |  |  |  |  |  |
Average price per share (in dollars per share) |  |  |  | $ 44.47 |  |  |  |  |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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