Stockholders' Equity - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Nov. 01, 2019	Dec. 31, 2018	Jan. 31, 2018
Schedule Of Capitalization Equity [Line Items]
Repurchase of common stock, shares	0	0	0	2,582,198
Aggregate cost of shares repurchased, common stock				$ 100,000,000
Average price of shares repurchased, common stock				$ 38.73
Remaining authorized share repurchased amount	$ 150,000,000		$ 150,000,000
Treasury stock, shares	12,056,688		12,056,688			12,056,688
Aggregate cost of treasury stock	$ 547,000,000		$ 547,000,000			$ 547,000,000
Subsequent Event
Schedule Of Capitalization Equity [Line Items]
Repurchase of shares of common stock authorized					$ 100,000,000
Remaining authorized share repurchased amount					$ 250,000,000
Maximum
Schedule Of Capitalization Equity [Line Items]
Repurchase of shares of common stock authorized							$ 250,000,000