Stockholders' Equity (Deficit) - Repurchase of Common Stock (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	May 02, 2018
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased (in shares)	521,498	0	521,498	1,560,633
Value of shares repurchased	$ 20,000,000.0		$ 20,000,000.0	$ 67,300,000
Shares acquired, average price per share (in usd per share)	$ 38.37		$ 38.37	$ 43.09
July 2015 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Value of shares repurchased				$ 67,200,000
Common Stock
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized increase					$ 1,000,000,000.0