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Stockholders' Deficit - Repurchase of Common Stock (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | May 02, 2018 | Mar. 31, 2017 | Jul. 31, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Value of shares repurchased | $ 49,600,000 | $ 77,100,000 | $ 67,300,000 | $ 401,800,000 |  |  |
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 |
Number of shares repurchased (in shares) | 1,154,047 | 1,780,578 | 1,560,633 | 10,575,532 |  |  |
Value of shares repurchased | $ 49,500,000 | $ 77,100,000 | $ 67,200,000 | $ 481,600,000 |  |  |
Shares purchased, average price per share (in usd per share) | $ 42.98 |  | $ 43.09 |  |  |  |
Common Stock | July 2015 Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  | 1,780,578 |  | 9,355,896 |  |  |
Value of shares repurchased |  | $ 77,100,000 |  | $ 401,600,000 |  |  |
Shares purchased, average price per share (in usd per share) |  | $ 43.29 |  | $ 42.93 |  |  |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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