Condensed Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Sales	$ 1,553.4	$ 1,710.3
Operating expenses:
Cost of goods sold	1,347.3	1,528.7
Selling and administration	107.0	100.5
Restructuring charges	4.0	4.0
Acquisition-related costs	0.0	0.3
Other operating income	0.1	8.1
Operating income	95.2	84.9
Earnings of non-consolidated affiliates	0.0	0.5
Interest expense	57.4	63.7
Interest income	0.2	0.4
Non-operating pension income	3.9	5.4
Other income	11.2	0.0
Income before taxes	53.1	27.5
Income tax provision	11.4	6.6
Net income	$ 41.7	$ 20.9
Net income per common share:
Basic	$ 0.25	$ 0.13
Diluted	0.25	0.12
Dividends per common share	$ 0.20	$ 0.20
Average common shares outstanding:
Basic	165.0	167.2
Diluted	166.1	169.2