Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Aggregate common stock and preferred stock authorized	300,000,000
Common stock, authorized	250,000,000.0
Common stock, par value	$ 1
Preferred Stock, authorized	50,000,000
Preferred Stock, outstanding	0
Dividends declared per common share	$ 0.880	$ 0.676	$ 0.588
Cost of shares repurchased	$ 116.5	$ 84.2	$ 41.4
Settlement of Tax Withholding on Employee Equity Compensation [Member]
Class of Stock [Line Items]
Shares repurchased	100,000	200,000	300,000
Cost of shares repurchased	$ 11.7	$ 11.0	$ 12.7
2019 Share Repurchase Program
Class of Stock [Line Items]
Shares repurchased	1,200,000	1,700,000	500,000
Cost of shares repurchased	$ 104.8	$ 73.2	$ 28.7
Share repurchase program	500.0
2006 Share Repurchase Program [Member]
Class of Stock [Line Items]
Share repurchase program	$ 1,000.0