Components of Inventories (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw material	$ 378.8	$ 366.3	$ 370.9
Work in progress	292.3	257.4	277.4
Finished products	220.1	200.4	194.7
Inventories	891.2	824.1	843.0
Inventory reserve at beginning of year	(83.2)	(85.1)	(80.6)
Reversal of reserve	5.0	11.3	1.4
Addition to reserve	(16.2)	(13.2)	(13.9)
Write-off against reserve	7.8	8.3	5.3
Translation difference	(6.3)	(4.5)	2.7
Inventory reserve at end of year	(92.9)	(83.2)	(85.1)
Total inventories, net of reserve	$ 798.3	$ 740.9	$ 757.9