Consolidated Statements of Earnings - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 4,965.1	$ 4,390.5	$ 3,962.0
Cost of sales	2,566.2	2,226.9	1,997.2
Gross profit	2,398.9	2,163.6	1,964.8
Operating and administrative expenses	1,400.2	1,282.8	1,169.5
Gain on sale of property and equipment	(0.5)	(1.0)	(0.5)
Operating income	999.2	881.8	795.8
Interest income	0.4	0.4	0.4
Interest expense	(12.6)	(9.1)	(6.5)
Earnings before income taxes	987.0	873.1	789.7
Income tax expense	235.1	294.5	290.3
Net earnings	$ 751.9	$ 578.6	$ 499.4
Basic net earnings per share (in dollars per share)	$ 2.62	$ 2.01	$ 1.73
Diluted net earnings per share (in dollars per share)	$ 2.62	$ 2.01	$ 1.73
Basic weighted average shares outstanding (in shares)	286,966,917	288,208,435	288,949,525
Diluted weighted average shares outstanding (in shares)	287,162,764	288,342,733	289,157,523