Other (Income) Expense, Net (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of Other Income (Expense) [Line Items]
Interest income									$ (1.6)	$ (0.9)	$ (2.0)
Foreign exchange (gains) losses									(1.8)	3.8	1.7
Litigation charges, net									205.2	595.1	288.6
Restructuring and productivity initiative costs	$ 4.1	$ 4.6	$ 11.9	$ 9.8	$ 14.5	$ 14.6	$ 8.5	$ 3.9	30.4	41.5	11.8
Acquisition-related items									(1.3)	24.7	2.3
Gore Proceeds							$ (210.5)		0.0	(210.5)	0.0
Gain on sale of investment									0.0	0.0	(7.1)
Other, net									(1.5)	(4.5)	(4.4)
Total other (income) expense, net									$ 229.4	$ 449.2	$ 290.9