Condensed Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Sales	$ 518.0	$ 577.4
Operating expenses:
Cost of goods sold	433.2	475.4
Selling and administration	47.0	43.5
Restructuring charges	1.2	1.0
Acquisition costs	10.4	0.2
Other operating expense	0.2	0.1
Operating income	26.0	57.2
Earnings of non-consolidated affiliates	0.4	0.4
Interest expense	7.1	9.7
Interest income	0.3	0.3
Income before taxes	19.6	48.2
Income tax provision	6.5	18.7
Net income	$ 13.1	$ 29.5
Net income per common share:
Basic	$ 0.17	$ 0.37
Diluted	$ 0.17	$ 0.37
Dividends per common share	$ 0.20	$ 0.20
Average common shares outstanding:
Basic	77.4	79.2
Diluted	78.5	80.5