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Schedule of Segment Earnings (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 768.6	$ 749.9	$ 738.2	$ 740.0	$ 698.1	$ 683.9	$ 667.0	$ 636.9	$ 2,996.7	$ 2,685.9	$ 2,536.5
Segment earnings									577.9	515.0	452.9
Other income (expense)									10.4	9.4	10.8
Interest expense									(10.1)	(7.3)	(7.4)
Earnings before provision for income taxes									520.8	462.5	402.5
Provision for income taxes									(224.3)	(136.0)	(119.6)
Earnings from continuing operations	$ 22.7	$ 93.7	$ 92.4	$ 87.7	$ 82.7	$ 83.2	$ 87.1	$ 73.5	296.5	326.5	282.9
Inter-segment
Segment Reporting Information [Line Items]
Net sales									(24.4)	(22.9)	(32.6)
Corporate
Segment Reporting Information [Line Items]
Other income (expense)									(47.0)	(45.2)	(43.0)
North America | Operating Segments
Segment Reporting Information [Line Items]
Net sales									1,904.8	1,743.2	1,703.0
Segment earnings									428.6	385.9	339.9
Rest of World | Operating Segments
Segment Reporting Information [Line Items]
Net sales									1,116.3	965.6	866.1
Segment earnings									$ 149.3	$ 129.1	$ 113.0

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