Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 1,666.8
Balance		1,616.3	$ 1,749.2
Cumulative foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(66.2)	(64.9)
Other comprehensive (loss) income before reclassifications		(18.0)	15.9
Balance		(84.2)	(49.0)
Unrealized net gain on cash flow derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		0.2	(0.7)
Other comprehensive (loss) income before reclassifications		0.9	(0.1)
Realized gains on derivatives reclassified to cost of products sold (net of income tax provision of $0.2 and $- in 2020 and 2019, respectively)		(0.6)
Balance		0.5	(0.8)
Pension liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(282.3)	(285.2)
Amounts reclassified from accumulated other comprehensive loss	[1]	3.6	2.9
Balance		(278.7)	(282.3)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ (362.4)	$ (332.1)

[1] Amortization of pension items: