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