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Stockholders' Equity - Repurchase of Common Stock (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | May 31, 2018 | Dec. 31, 2017 | Nov. 30, 2017 | Mar. 31, 2017 | Jul. 31, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 400,000,000.0 |  | $ 400,000,000.0 |  |  |  |  |
Value of shares repurchased |  | $ 121,500,000 | $ 452,000,000 | $ 523,300,000 | $ 757,300,000 |  |  |  |  |
Shares acquired under program (in shares) |  | 74,672,913 |  | 74,672,913 |  |  | 61,485,423 |  |  |
July 2015 Repurchase Program |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  | $ 1,500,000,000
Stock repurchase program, authorized increase |  |  |  |  |  | $ 1,000,000,000.0 |  |  | $ 1,500,000,000.0 |
Number of shares repurchased (in shares) |  | 2,959,638 | 1,661,782 | 13,535,170 | 5,198,090 |  |  |  |  |
Value of shares repurchased |  | $ 121,500,000 | $ 72,400,000 | $ 603,100,000 | $ 227,700,000 |  |  |  |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 400,000,000 |  |
Shares acquired under program (in shares) | 8,308,692 |  |  |  |  |  | 7,089,056 |  |  |
Shares acquired, average price per share (in usd per share) | $ 48.14 |  |  |  |  |  |  |  |  |
Share Trading Plan | Common Stock Repurchase Set One |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  | 2,959,638 |  | 12,315,534 |  |  |  |  |  |
Value of shares repurchased |  | $ 523,100,000 |  |  |  |  |  |  |  |
Shares acquired, average price per share (in usd per share) |  | $ 41.04 |  | $ 42.47 |  |  |  |  |  |

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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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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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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