Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 3,606.4	$ 3,256.0
Cost of sales	3,002.5	2,702.5
Gross profit	603.9	553.5
Selling and administrative expenses	362.7	347.4
Advertising expense	37.1	35.4
Income from operations	204.1	170.7
Interest expense, net	(37.7)	(39.7)
Net loss on extinguishments of long-term debt	0.0	(57.4)
Other (expense) income	(0.7)	0.9
Income before income taxes	165.7	74.5
Income tax expense	(38.7)	(16.3)
Net income	$ 127.0	$ 58.2
Net income per common share:
Basic (in dollars per share)	$ 0.83	$ 0.36
Diluted (in dollars per share)	$ 0.82	$ 0.36
Weighted-average common shares outstanding:
Basic (in shares)	152.2	159.4
Diluted (in shares)	154.8	162.8
Cash dividends declared per common share (in dollars per share)	$ 0.2100	$ 0.1600