Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net sales	$ 1,179.7	$ 950.5	$ 3,337.6	$ 2,751.1
Cost of goods sold	830.7	642.9	2,357.8	1,885.4
Gross profit	349.0	307.6	979.8	865.7
Selling & administrative expenses	185.2	157.5	559.5	473.4
Operating income	163.8	150.1	420.3	392.3
Interest expense, net	(18.4)	(11.6)	(54.5)	(34.3)
Loss on extinguishment of debt	0.0	(10.1)	0.0	(10.1)
Other expense, net	(2.9)	(4.8)	(13.5)	(16.7)
Total other expense	(21.3)	(26.5)	(68.0)	(61.1)
Income before income taxes	142.5	123.6	352.3	331.2
Provision for income taxes	27.8	40.8	75.4	103.7
Net income	114.7	82.8	276.9	227.5
Less: Net income attributable to noncontrolling interest	1.1	2.0	4.7	4.8
Net income	$ 113.6	$ 80.8	$ 272.2	$ 222.7
Earnings per share
Basic (USD per share)	$ 2.07	$ 1.47	$ 4.96	$ 4.05
Diluted (USD per share)	2.06	1.47	4.93	4.02
Cash dividends per common share (USD per share)	$ 0.77	$ 0.7	$ 2.31	$ 2.10