Income Taxes - Components of Earnings Before Income Taxes and Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
United States	$ 593.0	$ 524.4	$ 388.4
Foreign, principally Australia, Canada, New Zealand and the U.K.	382.1	346.5	237.7
Earnings before income taxes	975.1	870.9	626.1
Federal Current	44.6	43.6	3.8
Federal Deferred	(151.6)	(112.4)	(142.5)
Total Provision (benefit) for income taxes, Federal	(107.0)	(68.8)	(138.7)
State and local Current	50.6	36.6	11.1
State and local Deferred	(11.6)	(19.3)	(6.0)
Total Provision (benefit) for income taxes, State and local	39.0	17.3	5.1
Foreign Current	108.8	94.6	66.6
Foreign Deferred	(20.7)	(30.3)	(22.7)
Total Provision (benefit) for income taxes, Foreign	88.1	64.3	43.9
Total provision (benefit) for income taxes	$ 20.1	$ 12.8	$ (89.7)