Consolidated Statements of Earnings - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 4,390.5	$ 3,962.0	$ 3,869.2
Cost of sales	2,226.9	1,997.2	1,920.3
Gross profit	2,163.6	1,964.8	1,948.9
Operating and administrative expenses	1,282.8	1,169.5	1,121.5
Gain on sale of property and equipment	(1.0)	(0.5)	(1.4)
Operating income	881.8	795.8	828.8
Interest income	0.4	0.4	0.4
Interest expense	(9.1)	(6.5)	(3.1)
Earnings before income taxes	873.1	789.7	826.1
Income tax expense	294.5	290.3	309.7
Net earnings	$ 578.6	$ 499.4	$ 516.4
Basic net earnings per share (in dollars per share)	$ 2.01	$ 1.73	$ 1.77
Diluted net earnings per share (in dollars per share)	$ 2.01	$ 1.73	$ 1.77
Basic weighted average shares outstanding (in shares)	288,208,435	288,949,525	291,453,107
Diluted weighted average shares outstanding (in shares)	288,342,733	289,157,523	292,045,442