Condensed Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Sales	$ 1,710.3	$ 1,567.1
Operating expenses:
Cost of goods sold	1,528.7	1,397.5
Selling and administration	100.5	92.9
Restructuring charges	4.0	8.2
Acquisition-related costs	0.3	7.0
Other operating income (expense)	8.1	(0.4)
Operating income	84.9	61.1
Earnings of non-consolidated affiliates	0.5	0.5
Interest expense	63.7	52.4
Interest income	0.4	0.2
Non-operating pension income	5.4	8.5
Income before taxes	27.5	17.9
Income tax provision	6.6	4.5
Net income	$ 20.9	$ 13.4
Net income per common share:
Basic	$ 0.13	$ 0.08
Diluted	0.12	0.08
Dividends per common share	$ 0.20	$ 0.20
Average common shares outstanding:
Basic	167.2	165.6
Diluted	169.2	167.9