Condensed Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Sales	$ 1,554.9	$ 1,452.7	$ 4,648.5	$ 4,164.9
Operating expenses:
Cost of goods sold	1,345.6	1,284.4	4,143.4	3,696.7
Selling and administration	86.4	82.0	254.6	249.4
Restructuring charges	9.2	5.2	25.9	106.2
Acquisition-related costs	1.1	13.1	12.5	39.6
Other operating (expense) income	0.0	(0.2)	(0.1)	10.5
Operating income	112.6	67.8	212.0	83.5
Earnings of non-consolidated affiliates	0.5	0.5	1.5	1.1
Interest expense	53.1	47.5	158.0	143.6
Interest income	0.4	0.5	1.0	1.3
Income (loss) before taxes	60.4	21.3	56.5	(57.7)
Income tax provision (benefit)	7.7	3.8	(3.7)	(36.3)
Net income (loss)	$ 52.7	$ 17.5	$ 60.2	$ (21.4)
Net income (loss) per common share:
Basic	$ 0.32	$ 0.11	$ 0.36	$ (0.13)
Diluted	0.31	0.11	0.36	(0.13)
Dividends per common share	$ 0.20	$ 0.20	$ 0.60	$ 0.60
Average common shares outstanding:
Basic	166.3	165.2	166.0	165.2
Diluted	168.5	166.5	168.2	165.2