Accumulated Other Comprehensive Income - Reclassification Adjustments from Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Comprehensive Income Loss [Line Items]
Cost of products sold	$ 529.0	$ 500.9	$ 1,688.5	$ 1,541.5
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Other expense, net	$ (2.2)	$ (2.3)	$ (8.7)	$ (4.5)
Earnings before income taxes	153.6	127.2	594.8	588.8
Provision (benefit) for income taxes	(8.5)	28.4	71.6	6.6
Reclassification out of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income Loss [Line Items]
Net of tax	(7.4)	(5.8)	(32.1)	4.3
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member]
Other Comprehensive Income Loss [Line Items]
Earnings before income taxes	(5.0)	(5.2)	(26.9)	11.6
Provision (benefit) for income taxes	(0.9)	(1.1)	(3.9)	2.2
Net of tax	(4.1)	(4.1)	(23.0)	9.4
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	$ (4.9)	$ (5.1)	$ (26.5)	$ 12.0
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
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)	$ (0.1)	$ (0.4)	$ (0.4)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plan Items [Member]
Other Comprehensive Income Loss [Line Items]
Earnings before income taxes	(4.3)	(2.8)	(12.1)	(8.5)
Provision (benefit) for income taxes	(1.0)	(1.1)	(3.0)	(3.4)
Net of tax	(3.3)	(1.7)	(9.1)	(5.1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plan Items [Member] | Prior Service Cost [Member]
Other Comprehensive Income Loss [Line Items]
Other expense, net	2.4	2.6	7.4	7.7
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plan Items [Member] | Unrecognized Actuarial (Loss) [Member]
Other Comprehensive Income Loss [Line Items]
Other expense, net	$ (6.7)	$ (5.4)	$ (19.5)	$ (16.2)