Condensed Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Sales	$ 533.6	$ 593.6	$ 1,587.0	$ 1,741.4
Operating expenses:
Cost of goods sold	460.0	492.3	1,338.7	1,431.3
Selling and administration	35.8	41.8	122.7	127.0
Restructuring charges	0.3	1.2	2.2	4.5
Acquisition-related costs	14.5	1.0	35.4	1.4
Other operating (expense) income	(0.1)	0.0	42.1	0.8
Operating income	22.9	57.3	130.1	178.0
Earnings of non-consolidated affiliates	0.5	0.5	1.3	1.4
Interest expense	14.4	17.7	39.7	37.0
Interest income	0.3	0.2	0.9	0.9
Income from continuing operations before taxes	9.3	40.3	92.6	143.3
Income tax provision	3.4	14.2	31.3	51.1
Income from continuing operations, net	5.9	26.1	61.3	92.2
Income from discontinued operations, net	0.0	0.0	0.0	0.7
Net income	$ 5.9	$ 26.1	$ 61.3	$ 92.9
Basic income per common share:
Income from continuing operations, net	$ 0.08	$ 0.33	$ 0.79	$ 1.17
Income from discontinued operations, net	0.00	0.00	0.00	0.01
Net income	0.08	0.33	0.79	1.18
Diluted income per common share:
Income from continuing operations, net	0.08	0.33	0.78	1.15
Income from discontinued operations, net	0.00	0.00	0.00	0.01
Net income	0.08	0.33	0.78	1.16
Dividends per common share	$ 0.20	$ 0.20	$ 0.60	$ 0.60
Average common shares outstanding:
Basic	77.6	78.4	77.5	78.8
Diluted	78.3	79.5	78.5	80.0