Consolidated Statements of Earnings - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net sales	$ 5,647.3	$ 5,333.7	$ 4,965.1
Cost of sales	3,079.5	2,818.3	2,566.2
Gross profit	2,567.8	2,515.4	2,398.9
Operating and administrative expenses	1,427.4	1,459.4	1,400.2
Gain on sale of property and equipment	(1.4)	(1.2)	(0.5)
Operating income	1,141.8	1,057.2	999.2
Interest income	0.6	0.4	0.4
Interest expense	(9.7)	(13.9)	(12.6)
Earnings before income taxes	1,132.7	1,043.7	987.0
Income tax expense	273.6	252.8	235.1
Net earnings	$ 859.1	$ 790.9	$ 751.9
Basic net earnings per share (in dollars per share)	$ 1.50	$ 1.38	$ 1.31
Diluted net earnings per share (in dollars per share)	$ 1.49	$ 1.38	$ 1.31
Basic weighted average shares outstanding (in shares)	573,778,761	573,202,152	573,933,834
Diluted weighted average shares outstanding (in shares)	575,671,954	574,441,628	574,325,528