Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Net sales	$ 2,237.3	$ 1,879.9	$ 4,373.7	$ 3,687.0
Cost of sales	(1,648.5)	(1,431.1)	(3,251.7)	(2,834.5)
Gross profit	588.8	448.8	1,122.0	852.5
Selling, general and administrative expenses	(156.7)	(146.3)	(317.7)	(291.3)
Other expense, net	(16.3)	(7.9)	(31.9)	(28.3)
Income from operations	415.8	294.6	772.4	532.9
Non-operating pension income	3.6	5.0	7.3	9.8
Interest expense, net	(18.8)	(24.9)	(38.7)	(48.4)
Income before taxes	400.6	274.7	741.0	494.3
Provision for income taxes	(99.1)	(67.4)	(185.3)	(120.5)
Net income	$ 301.5	$ 207.3	$ 555.7	$ 373.8
Net income per common share:
Basic	$ 3.22	$ 2.18	$ 5.93	$ 3.94
Diluted	3.20	2.17	5.91	3.92
Dividends declared per common share	$ 1.25	$ 1.00	$ 2.25	$ 2.00
Statements of Comprehensive Income:
Net income	$ 301.5	$ 207.3	$ 555.7	$ 373.8
Changes in unrealized losses on marketable debt securities, net of tax of $0.1 million, $0.0 million, $0.5 million, and $0.1 million	(0.3)	(0.1)	(1.5)	(0.2)
Amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of ($0.4) million, ($0.8) million, ($0.7) million, and ($1.7) million	1.1	2.5	2.3	5.0
Other comprehensive income	0.8	2.4	0.8	4.8
Comprehensive income	$ 302.3	$ 209.7	$ 556.5	$ 378.6