Accumulated Other Comprehensive Income - Reclassification Adjustments from Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Comprehensive Income Loss [Line Items]
Cost of products sold	$ 500.9	$ 479.3	$ 1,541.5	$ 1,760.0
Earnings before income taxes	127.2	103.5	588.8	368.8
Provision for income taxes	28.4	(54.4)	6.6	133.9
Reclassification out of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income Loss [Line Items]
Net of tax	(5.8)	11.7	4.3	52.0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member]
Other Comprehensive Income Loss [Line Items]
Earnings before income taxes	(5.2)	17.7	11.6	75.2
Provision for income taxes	(1.1)	3.8	2.2	17.2
Net of tax	(4.1)	13.9	9.4	58.0
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)	18.1	12.0	76.5
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Forward Starting Interest Rate Swaps [Member]
Other Comprehensive Income Loss [Line Items]
Interest expense	(0.1)	(0.4)	(0.4)	(1.3)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plan Items [Member]
Other Comprehensive Income Loss [Line Items]
Prior service cost	2.6	1.9	7.7	5.8
Unrecognized actuarial (loss)	(5.4)	(5.1)	(16.2)	(15.1)
Earnings before income taxes	(2.8)	(3.2)	(8.5)	(9.3)
Provision for income taxes	(1.1)	(1.0)	(3.4)	(3.3)
Net of tax	$ (1.7)	$ (2.2)	$ (5.1)	$ (6.0)