Condensed Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		48 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020
Income Statement [Abstract]
Sales	$ 1,425.1	$ 1,553.4
Operating expenses:
Cost of goods sold	1,374.2	1,347.3
Selling and administration	96.7	107.0
Restructuring charges	1.7	4.0	$ 242.0
Other operating income	0.0	0.1
Operating (loss) income	(47.5)	95.2
Interest expense	63.1	57.4
Interest income	0.1	0.2
Non-operating pension income	(4.6)	(3.9)
Other income	0.0	11.2
Income (loss) before taxes	(105.9)	53.1
Income tax (benefit) provision	(25.9)	11.4
Net (loss) income	$ (80.0)	$ 41.7
Net (loss) income per common share:
Basic	$ (0.51)	$ 0.25
Diluted	$ (0.51)	$ 0.25
Average common shares outstanding:
Basic	157.8	165.0
Diluted	157.8	166.1