Capital Stock - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 31, 2018
Equity Class Of Treasury Stock [Line Items]
Total cost of shares repurchased	$ 143,000,000.0	$ 357,700,000	$ 150,300,000
Dividends per share of common stock	$ 0.64	$ 0.55	$ 0.47
2018 Repurchase Plan
Equity Class Of Treasury Stock [Line Items]
Authorized amount to repurchase outstanding common stock				$ 500,000,000
Remaining authorized amount to repurchase outstanding common stock	$ 241,800,000