Condensed Consolidated Statements of Earnings - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 1,267.9	$ 1,121.5	$ 2,453.7	$ 2,169.2
Cost of sales	650.2	563.0	1,258.4	1,092.7
Gross profit	617.7	558.5	1,195.3	1,076.5
Operating and administrative expenses	349.3	321.6	692.0	627.5
Gain on sale of property and equipment	(0.6)	(0.6)	(0.2)	(1.0)
Operating income	269.0	237.5	503.5	450.0
Interest income	0.1	0.1	0.2	0.2
Interest expense	(3.2)	(2.2)	(5.9)	(3.9)
Earnings before income taxes	265.9	235.4	497.8	446.3
Income tax expense	54.7	86.5	112.3	163.2
Net earnings	$ 211.2	$ 148.9	$ 385.5	$ 283.1
Basic net earnings per share (in dollars per share)	$ 0.74	$ 0.52	$ 1.34	$ 0.98
Diluted net earnings per share (in dollars per share)	$ 0.74	$ 0.52	$ 1.34	$ 0.98
Basic weighted average shares outstanding (in shares)	287,140,426	288,655,020	287,391,614	288,948,734
Diluted weighted average shares outstanding (in shares)	287,257,487	288,788,963	287,559,468	289,099,316