Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	AOCI Attributable to Parent
Beginning Balance at Dec. 31, 2021	$ 519.7	$ 0.6	$ 561.3	$ 1,011.4	$ (944.0)	$ (109.6)	[1]
Balance at Dec. 31, 2021		47,302,299			15,472,856
Stock issuance, net, shares		106,490
Cash dividends - per common share	(32.7)			(32.7)
Share-based employee compensation	8.0		8.0
Net earnings	154.1			154.1
Other comprehensive income (loss)	17.1					17.1
Acquisition of treasury stock	(145.0)				$ (145.0)
Acquisition of treasury stock, shares		(1,636,950)			1,636,950
Ending Balance at Sep. 30, 2022	521.2	$ 0.6	569.3	1,132.8	$ (1,089.0)	(92.5)	[1]
Balance at Sep. 30, 2022		45,771,839			17,109,806
Beginning Balance at Jun. 30, 2022	527.8	$ 0.6	565.7	1,086.0	$ (1,029.0)	(95.5)	[1]
Balance at Jun. 30, 2022		46,462,821			16,413,011
Stock issuance, net, shares		5,813
Cash dividends - per common share	(10.7)			(10.7)
Share-based employee compensation	3.6		3.6
Net earnings	57.5			57.5
Other comprehensive income (loss)	3.0					3.0
Acquisition of treasury stock	(60.0)				$ (60.0)
Acquisition of treasury stock, shares		(696,795)			696,795
Ending Balance at Sep. 30, 2022	521.2	$ 0.6	569.3	1,132.8	$ (1,089.0)	(92.5)	[1]
Balance at Sep. 30, 2022		45,771,839			17,109,806
Beginning Balance at Dec. 31, 2022	$ 535.0	$ 0.6	573.6	1,169.9	$ (1,109.0)	(100.1)	[1]
Balance at Dec. 31, 2022	45,572,185	45,572,185			17,364,635
Stock issuance, net, shares		77,713			(18)
Cash dividends - per common share	$ (34.7)			(34.7)
Share-based employee compensation	10.5		10.5
Net earnings	177.0			177.0
Other comprehensive income (loss)	(4.3)					(4.3)
Acquisition of treasury stock	(98.0)				$ (98.0)
Acquisition of treasury stock, shares		(1,345,381)			1,345,381
Ending Balance at Sep. 30, 2023	$ 585.5	$ 0.6	584.1	1,312.2	$ (1,207.0)	(104.4)	[1]
Balance at Sep. 30, 2023	44,304,517	44,304,517			18,709,998
Beginning Balance at Jun. 30, 2023	$ 566.7	$ 0.6	580.4	1,254.1	$ (1,166.6)	(101.8)	[1]
Balance at Jun. 30, 2023		44,823,285			18,175,262
Stock issuance, net, shares		15,968
Cash dividends - per common share	(11.4)			(11.4)
Share-based employee compensation	3.7		3.7
Net earnings	69.5			69.5
Other comprehensive income (loss)	(2.6)					(2.6)
Acquisition of treasury stock	(40.4)				$ (40.4)
Acquisition of treasury stock, shares		(534,736)			534,736
Ending Balance at Sep. 30, 2023	$ 585.5	$ 0.6	$ 584.1	$ 1,312.2	$ (1,207.0)	$ (104.4)	[1]
Balance at Sep. 30, 2023	44,304,517	44,304,517			18,709,998

[1] Amounts are net of tax.