Shareholder's Equity (Detail) - USD ($)		12 Months Ended
	May 08, 2018	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 07, 2021
Shareholders Equity
Common stock, shares authorized		426,000,000.0	426,000,000.0
Common stock, par value (per share)		$ 0.01	$ 0.01
Stock Repurchased During Period, Value		$ 150,000,000.0	$ 150,200,000	$ 150,000,000.0
Increase (Decrease) to Quarterly Dividend Rate					5.00%
Prior Quarter Approved Quarterly Dividend			20.00%
Dividends payable amount per share		$ 0.21
Dividends payable		$ 33,000,000.0	$ 33,200,000
Dividends paid per common share		$ 0.80	$ 0.76	$ 0.72
May 2018 Share Repurchase Program [Member]
Shareholders Equity
Authorized amount to repurchase shares of common stock	$ 750,000,000
Stock Repurchase Program Expiration Date	May 31, 2021
Stock Repurchased During Period, Value		$ 50,000,000	$ 150,200,000
Stock Repurchased During Period, Shares		800,000	3,700,000
December 2020 Share Repurchase Program [Member]
Shareholders Equity
Authorized amount to repurchase shares of common stock					$ 750,000,000
Stock Repurchased During Period, Value		$ 100,000,000
Remaining authorized repurchase amount		$ 650,000,000
Stock Repurchased During Period, Shares		1,300,000