Consolidated Statements Of Operations - USD ($) shares in Millions, $ 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	$ 4,186.1	$ 3,891.7	$ 7,792.5	$ 7,147.6
Cost of sales	3,490.5	3,250.9	6,493.0	5,953.3
Gross profit	695.6	640.8	1,299.5	1,194.3
Selling and administrative expenses	381.4	363.5	744.1	710.9
Advertising expense	48.7	46.5	85.8	81.9
Income from operations	265.5	230.8	469.6	401.5
Interest expense, net	(37.2)	(35.9)	(74.9)	(75.6)
Net loss on extinguishments of long-term debt	0.0	0.0	0.0	(57.4)
Other income, net	1.5	0.4	0.8	1.3
Income before income taxes	229.8	195.3	395.5	269.8
Income tax expense	(56.8)	(54.4)	(95.5)	(70.8)
Net income	$ 173.0	$ 140.9	$ 300.0	$ 199.0
Net income per common share:
Basic (in dollars per share)	$ 1.14	$ 0.90	$ 1.98	$ 1.26
Diluted (in dollars per share)	$ 1.12	$ 0.89	$ 1.94	$ 1.24
Weighted-average common shares outstanding:
Basic (in shares)	151.6	156.0	151.9	157.7
Diluted (in shares)	153.9	159.0	154.4	160.9
Cash dividends declared per common share (in dollars per share)	$ 0.2100	$ 0.1600	$ 0.4200	$ 0.3200