Components of Provision for Income Taxes (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes
Current, Federal		$ 66.4	$ 60.1	$ 148.0
Current, State		14.8	15.6	9.4
Current, International		19.9	38.6	43.8
Deferred, Federal		0.4	(1.7)	23.5
Deferred, State		1.8	1.5	5.8
Deferred, International		(1.2)	(0.5)	(6.2)
Provision for income taxes	[1]	$ 102.1	$ 113.6	$ 224.3

[1] In 2017, the Company recorded a one-time charge of $81.8 million associated with U.S. Tax Reform, primarily related to the repatriation of undistributed foreign earnings. For additional information, see Note 15 “Income Taxes.”