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Stockholders' Deficit - Repurchase of Common Stock (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | May 02, 2018 | Mar. 31, 2017 | Jul. 31, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Value of shares repurchased | $ 17,700,000 | $ 324,700,000 |  |  |
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) | 406,586 | 8,794,954 |  |  |
Value of shares repurchased | $ 17,700,000 | $ 404,700,000 |  |  |
Shares acquired, average price per share (in usd per share) | $ 43.41 |  |  |  |
Common Stock | July 2015 Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of shares repurchased (in shares) |  | 7,575,318 |  |  |
Value of shares repurchased |  | $ 324,700,000 |  |  |
Shares acquired, average price per share (in usd per share) |  | $ 42.86 |  |  |

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