Other Income (Expense), Net (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Income and Expenses [Abstract]
Foreign currency loss	$ (2.4)	$ (3.5)	$ (16.2)	$ (6.8)
Equity income	1.0	0.6	3.0	2.9
Expected return on pension assets/amortization	2.3	2.8	7.5	8.9
Other miscellaneous income	1.0	1.3	1.6	1.0
Total other income (expense), net	$ 1.9	$ 1.2	$ (4.1)	$ 6.0