Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Net sales	$ 1,976.3	$ 2,136.4
Cost of sales	(1,544.9)	(1,603.2)
Gross profit	431.4	533.2
Selling, general and administrative expenses	(148.2)	(161.1)
Other expense, net	(12.5)	(15.6)
Income from operations	270.7	356.5
Non-operating pension (expense) income	(2.0)	3.6
Interest expense, net	(15.4)	(19.8)
Income before taxes	253.3	340.3
Provision for income taxes	(63.2)	(86.1)
Net income	$ 190.1	$ 254.2
Net income per common share:
Basic	$ 2.12	$ 2.71
Diluted	2.11	2.70
Dividends declared per common share	$ 1.25	$ 1.00
Statements of Comprehensive Income:
Net income	$ 190.1	$ 254.2
Changes in unrealized gains (losses) on marketable debt securities,net of tax of ($0.2) million and $0.4 million for 2023 and 2022 respectively	0.5	(1.2)
Amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of ($0.6) million and ($0.3) million for 2023 and 2022, respectively	1.6	1.2
Other comprehensive income	2.1	0.0
Comprehensive income	$ 192.2	$ 254.2