Schedule of Changes in Balance Sheet Position of Restructuring Reserves (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 66.6	$ 81.9	$ 87.9	$ 79.8
Provision/ Charge	3.4	41.1	20.6	84.3
Provision/ Reversal	(0.1)	(0.1)	(0.8)	(1.9)
Cash payments	(11.8)	(12.5)	(50.9)	(45.6)
Translation difference	0.3	(0.5)	1.6	(6.7)
Restructuring reserve, ending balance	58.4	109.9	58.4	109.9
Restructuring employee-related
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	66.5	81.9	87.7	79.6
Provision/ Charge	3.4	41.1	20.6	84.0
Provision/ Reversal	(0.1)	(0.1)	(0.8)	(1.9)
Cash payments	(11.8)	(12.5)	(50.9)	(45.1)
Translation difference	0.4	(0.5)	1.8	(6.7)
Restructuring reserve, ending balance	58.4	$ 109.9	58.4	109.9
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	0.1		0.2	0.2
Provision/ Charge				0.3
Cash payments				$ (0.5)
Translation difference	$ (0.1)		$ (0.2)