Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Net sales	$ 2,136.4	$ 1,807.2
Cost of sales	(1,603.2)	(1,403.5)
Gross profit	533.2	403.7
Selling, general and administrative expenses	(161.1)	(145.0)
Other expense, net	(15.6)	(20.4)
Income from operations	356.5	238.3
Non-operating pension income	3.6	4.8
Interest expense, net	(19.8)	(23.5)
Income before taxes	340.3	219.6
Provision for income taxes	(86.1)	(53.1)
Net income	$ 254.2	$ 166.5
Net income per common share:
Basic	$ 2.71	$ 1.75
Diluted	2.70	1.75
Dividends declared per common share	$ 1.00	$ 1.00
Statements of Comprehensive Income:
Net income	$ 254.2	$ 166.5
Changes in unrealized (losses) gains on marketable debt securities, net of tax of $0.0 million and $0.0 million for 2022 and 2021	(1.2)	(0.1)
Amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of ($0.8) million and ($0.8) million for 2022 and 2021	1.2	2.5
Other comprehensive income	0.0	2.4
Comprehensive income	$ 254.2	$ 168.9