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Stockholders' Deficit - Repurchase of Common Stock (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 13, 2014 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | May 02, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Number of shares repurchased (in shares) | 3,932,244 | 0 | 1,154,047 | 0 | 1,560,633 |
Value of shares repurchased |  |  | $ 49,600,000 |  | $ 67,300,000 |
Shares acquired, average price per share (in usd per share) | $ 33.06 |  |  |  |  |
July 2015 Repurchase Program |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Value of shares repurchased |  |  | $ 49,500,000 |  | $ 67,200,000 |
Common Stock | July 2015 Repurchase Program |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized increase |  |  |  |  |  | $ 1,000,000,000.0

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