Condensed Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Sales	$ 2,321.7	$ 2,340.1	$ 7,399.2	$ 6,480.2
Operating expenses:
Cost of goods sold	1,840.9	1,679.8	5,599.8	4,815.8
Selling and administration	92.7	107.2	296.0	314.7
Restructuring charges	7.6	3.6	14.3	24.5
Other operating income (expense)	13.0	(0.5)	16.3	0.0
Operating income	393.5	549.0	1,505.4	1,325.2
Interest expense	36.0	54.0	103.4	204.4
Interest income	0.5	0.1	1.2	0.2
Non-operating pension income	(9.9)	(9.2)	(29.0)	(26.7)
Income before taxes	367.9	504.3	1,432.2	1,147.7
Income tax provision	52.7	113.6	301.9	157.6
Net income	$ 315.2	$ 390.7	$ 1,130.3	$ 990.1
Net income per common share:
Basic	$ 2.23	$ 2.44	$ 7.62	$ 6.21
Diluted	$ 2.18	$ 2.38	$ 7.44	$ 6.07
Average common shares outstanding:
Basic	141.2	160.1	148.3	159.4
Diluted	144.3	163.9	151.9	163.0