CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Sales	$ 2,854.4	$ 2,241.2	$ 2,515.0
Operating expenses:
Cost of goods sold	2,486.8	1,853.2	2,033.7
Selling and administration	186.5	166.2	190.0
Restructuring charges	2.7	15.7	5.5
Acquisition-related costs	123.4	4.2	0.0
Other operating income	45.7	1.5	0.7
Operating income	100.7	203.4	286.5
Earnings of non-consolidated affiliates	1.7	1.7	2.8
Interest expense	97.0	43.8	38.6
Interest income	1.1	1.3	0.6
Other income (expense)	0.2	0.1	(1.3)
Income from continuing operations before taxes	6.7	162.7	250.0
Income tax provision	8.1	57.7	71.4
Income from continuing operations	(1.4)	105.0	178.6
Income from discontinued operations, net	0.0	0.7	0.0
Net income	$ (1.4)	$ 105.7	$ 178.6
Basic income per common share:
Income from continuing operations	$ (0.01)	$ 1.33	$ 2.24
Income from discontinued operations, net	0.00	0.01	0.00
Net income	(0.01)	1.34	2.24
Diluted income per common share:
Income from continuing operations	(0.01)	1.32	2.21
Income from discontinued operations, net	0.00	0.01	0.00
Net income	$ (0.01)	$ 1.33	$ 2.21
Average common shares outstanding:
Basic	103.4	78.6	79.9
Diluted	103.4	79.7	80.9