Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions			3 Months Ended	6 Months Ended
	Jul. 15, 2019	May 07, 2019	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Feb. 25, 2016
Common stock dividends paid				$ 149,300,000	$ 118,900,000
Dividends paid per common share (in dollars per share)		$ 0.79
Stock repurchase program, authorized amount						$ 200,000,000.0
Repurchases of common stock under stock repurchase program			0	0
Common stock repurchase authorization amount available			$ 193,000,000.0	$ 193,000,000.0
Subsequent Event
Common stock dividends paid	$ 74,700,000