Accumulated Other Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 1,812.4	$ 1,544.8
Other comprehensive income before reclassifications		9.3	4.4
Balance		1,745.8	1,553.3
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(15.3)
Other comprehensive income before reclassifications		1.5
Balance		(13.8)
Derivative Financial Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(4.1)
Other comprehensive income before reclassifications		7.8
Balance		3.7
AOCI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(19.4)	(29.2)
Other comprehensive income before reclassifications		9.3
Balance	[1]	$ (10.1)	$ (24.8)

[1] Accumulated Other Comprehensive Income (Loss) ("AOCI").