Accumulated Other Comprehensive (Loss) Income - Reclassification Adjustments from Other Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Comprehensive Income Loss [Line Items]
Cost of products sold	$ 2,132.9	$ 2,381.8	$ 1,800.6
Interest income	2.2	2.9	9.4
Earnings before income taxes	464.6	399.6	153.2
Provision (benefit) for income taxes	(1,348.8)	95.0	7.0
Reclassification out of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income Loss [Line Items]
Net of tax	(3.5)	15.9	83.8
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member]
Other Comprehensive Income Loss [Line Items]
Earnings before income taxes	4.6	19.6	121.0
Provision (benefit) for income taxes	0.8	(6.2)	28.0
Net of tax	3.8	25.8	93.0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Foreign Exchange Forward Contracts [Member]
Other Comprehensive Income Loss [Line Items]
Cost of products sold	5.1	87.7	122.3
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Forward Starting Interest Rate Swaps [Member]
Other Comprehensive Income Loss [Line Items]
Other expense		(66.4)
Interest expense	(0.5)	(1.7)	(1.3)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plan Items [Member]
Other Comprehensive Income Loss [Line Items]
Prior service cost	10.3	7.8	5.6
Unrecognized actuarial (loss)	(22.1)	(22.9)	(20.1)
Earnings before income taxes	(11.8)	(15.1)	(14.5)
Provision (benefit) for income taxes	(4.5)	(5.2)	(5.3)
Net of tax	$ (7.3)	$ (9.9)	$ (9.2)