Schedule of Changes in Balance Sheet Position of Restructuring Reserves (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 37.5	$ 87.9
Provision/ Charge	2.5	13.5
Provision/ Reversal	(0.5)	(0.3)
Cash payments	(9.3)	(17.6)
Translation difference	0.6	3.5
Restructuring reserve, ending balance	30.8	87.0
Restructuring employee-related
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	37.1	87.7
Provision/ Charge	2.3	13.5
Provision/ Reversal	(0.1)	(0.3)
Cash payments	(9.3)	(17.6)
Translation difference	0.6	3.5
Restructuring reserve, ending balance	30.6	86.8
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	0.4	0.2
Provision/ Charge	0.2
Provision/ Reversal	(0.4)
Restructuring reserve, ending balance	$ 0.2	$ 0.2