Condensed Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Sales	$ 1,526.5	$ 1,364.0	$ 3,093.6	$ 2,712.2
Operating expenses:
Cost of goods sold	1,404.1	1,236.9	2,797.8	2,412.3
Selling and administration	80.0	79.3	168.2	167.4
Restructuring charges	8.5	8.2	16.7	101.0
Acquisition-related costs	4.4	16.3	11.4	26.5
Other operating income (expense)	0.3	(0.2)	(0.1)	10.7
Operating income	29.8	23.1	99.4	15.7
Earnings of non-consolidated affiliates	0.5	0.4	1.0	0.6
Interest expense	52.5	47.6	104.9	96.1
Interest income	0.4	0.5	0.6	0.8
Loss before taxes	(21.8)	(23.6)	(3.9)	(79.0)
Income tax benefit	(15.9)	(22.6)	(11.4)	(40.1)
Net (loss) income	$ (5.9)	$ (1.0)	$ 7.5	$ (38.9)
Net (loss) income per common share:
Basic	$ (0.04)	$ (0.01)	$ 0.05	$ (0.24)
Diluted	(0.04)	(0.01)	0.04	(0.24)
Dividends per common share	$ 0.20	$ 0.20	$ 0.40	$ 0.40
Average common shares outstanding:
Basic	166.1	165.2	165.8	165.1
Diluted	166.1	165.2	168.0	165.1