Condensed Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Sales	$ 1,872.4	$ 1,554.9	$ 5,311.1	$ 4,648.5
Operating expenses:
Cost of goods sold	1,441.7	1,349.3	4,431.1	4,154.7
Selling and administration	110.8	91.1	321.6	268.8
Restructuring charges	3.3	9.2	13.7	25.9
Acquisition-related costs	0.4	1.1	1.0	12.5
Other operating (expense) income	(1.7)	0.0	6.4	(0.1)
Operating income	314.5	104.2	550.1	186.5
Earnings (losses) of non-consolidated affiliates	0.4	0.5	(20.2)	1.5
Interest expense	59.2	53.1	184.0	158.0
Interest income	0.3	0.4	1.1	1.0
Non-operating pension income	5.4	8.4	16.2	25.5
Income before taxes	261.4	60.4	363.2	56.5
Income tax provision (benefit)	66.3	7.7	88.6	(3.7)
Net income	$ 195.1	$ 52.7	$ 274.6	$ 60.2
Net income per common share:
Basic	$ 1.17	$ 0.32	$ 1.64	$ 0.36
Diluted	1.16	0.31	1.63	0.36
Dividends per common share	$ 0.20	$ 0.20	$ 0.60	$ 0.60
Average common shares outstanding:
Basic	167.0	166.3	167.1	166.0
Diluted	168.6	168.5	168.9	168.2