Components of Inventories (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw material	$ 370.9	$ 333.2	$ 286.4
Work in progress	277.4	263.8	233.1
Finished products	194.7	187.9	166.2
Inventories	843.0	784.9	685.7
Inventory reserve at beginning of year	(80.6)	(76.7)	(68.2)
Reversal of reserve	1.4	4.8	2.9
Addition to reserve	(13.9)	(7.3)	(16.2)
Write-off against reserve	5.3	5.2	3.0
Translation difference	2.7	(6.6)	1.8
Inventory reserve at end of year	(85.1)	(80.6)	(76.7)
Total inventories, net of reserve	$ 757.9	$ 704.3	$ 609.0