Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 2,729.2	$ 2,500.4	$ 2,544.9	$ 2,608.1	$ 2,603.8	$ 2,461.3	$ 2,578.5	$ 2,430.0	$ 10,382.6		$ 10,073.6		$ 9,169.6
Gross profit	566.7	504.3	535.5	542.5	534.2	495.3	526.5	501.0	2,149.0		2,057.0		1,844.1
Income before taxes	(10.6)	132.5	190.2	194.4	228.0	185.1	200.4	190.3	506.5		803.8		675.7
Net income	(55.6)	88.2	128.3	142.1	144.2	135.5	148.4	133.5	303.0	[1]	561.6	[1]	457.5	[1]
Net income attributable to controlling interest	$ 62.6	$ 90.8	$ 129.8	$ 143.9	$ 147.7	$ 137.8	$ 148.4	$ 133.2	$ 427.1		$ 567.1		$ 456.8
Earnings per share - basic	$ 0.72	$ 1.04	$ 1.48	$ 1.63	$ 1.67	$ 1.56	$ 1.68	$ 1.51	$ 4.88		$ 6.43		$ 5.18
Earnings per share - diluted	0.72	1.04	1.47	1.62	1.67	1.56	1.68	1.51	4.87		6.42		5.17
Cash dividend per share - paid	$ 0.60	$ 0.60	$ 0.60	$ 0.58	$ 0.58	$ 0.58	$ 0.58	$ 0.56	$ 2.38		$ 2.30		$ 2.22

[1] See Note 13 for further details – includes tax effects where applicable.