Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 1,052.3	$ 1,010.0	$ 2,947.9	$ 2,744.4
Cost of goods sold	738.6	699.7	2,082.4	1,935.5
Gross profit	313.7	310.3	865.5	808.9
Operating Expenses:
Selling, general and administrative expenses	158.7	156.5	479.6	456.2
Losses and other expenses, net	3.0	0.7	8.5	5.5
Restructuring charges	1.9	0.6	2.1	1.2
Income from equity method investments	(4.5)	(4.4)	(15.5)	(15.3)
Operating income	154.6	156.9	390.8	361.3
Interest expense, net	7.6	7.0	23.3	19.6
Other income, net	0.0	0.0	(0.2)	(0.2)
Income from continuing operations before income taxes	147.0	149.9	367.7	341.9
Provision for income taxes	43.0	48.2	103.8	104.0
Income from continuing operations	104.0	101.7	263.9	237.9
Discontinued Operations:
Loss from discontinued operations before income taxes	(0.8)	0.0	(2.3)	(0.9)
Benefit from income taxes	(0.3)	0.0	(0.9)	(0.3)
Loss from discontinued operations	(0.5)	0.0	(1.4)	(0.6)
Net income	$ 103.5	$ 101.7	$ 262.5	$ 237.3
Earnings per share – Basic:
Income from continuing operations (in dollars per share)	$ 2.48	$ 2.35	$ 6.23	$ 5.46
Loss from discontinued operations (in dollars per share)	(0.01)	0.00	(0.03)	(0.01)
Net income (in dollars per share)	2.47	2.35	6.20	5.45
Earnings per share – Diluted:
Income from continuing operations (in dollars per share)	2.45	2.33	6.15	5.39
Loss from discontinued operations (in dollars per share)	(0.01)	0.00	(0.03)	(0.01)
Net income (in dollars per share)	$ 2.44	$ 2.33	$ 6.12	$ 5.38
Average shares outstanding:
Weighted Average Number of Shares Outstanding - Basic	41.9	43.2	42.3	43.6
Weighted Average Number of Shares Outstanding - Diluted	42.4	43.7	42.9	44.2
Cash dividends declared per share	$ 0.51	$ 0.43	$ 1.45	$ 1.22