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, 2022	$ 535.0	$ 0.6	$ 573.6	$ 1,169.9	$ (1,109.0)	$ (100.1)	[1]
Balance, shares at Dec. 31, 2022		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, shares at Sep. 30, 2023		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, shares 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, shares at Sep. 30, 2023		44,304,517			18,709,998
Beginning Balance at Dec. 31, 2023	$ 591.8	$ 0.6	591.7	1,346.6	$ (1,242.4)	(104.7)	[1]
Balance, shares at Dec. 31, 2023	43,902,061	43,902,061			19,152,279
Stock issuance, net, shares		115,001
Cash dividends - per common share	$ (37.2)			(37.2)
Share-based employee compensation	8.3		8.3
Net earnings	202.7			202.7
Other comprehensive income (loss)	(8.2)					(8.2)
Acquisition of treasury stock	(40.4)				$ (40.4)
Acquisition of treasury stock, shares		(352,385)			352,385
Ending Balance at Sep. 30, 2024	$ 717.0	$ 0.6	600.0	1,512.1	$ (1,282.8)	(112.9)	[1]
Balance, shares at Sep. 30, 2024	43,664,677	43,664,677			19,504,664
Beginning Balance at Jun. 30, 2024	$ 669.0	$ 0.6	595.1	1,447.5	$ (1,267.7)	(106.5)	[1]
Balance, shares at Jun. 30, 2024		43,787,757			19,378,672
Stock issuance, net, shares		2,912
Cash dividends - per common share	(12.3)			(12.3)
Share-based employee compensation	4.9		4.9
Net earnings	76.9			76.9
Other comprehensive income (loss)	(6.4)					(6.4)
Acquisition of treasury stock	(15.1)				$ (15.1)
Acquisition of treasury stock, shares		(125,992)			125,992
Ending Balance at Sep. 30, 2024	$ 717.0	$ 0.6	$ 600.0	$ 1,512.1	$ (1,282.8)	$ (112.9)	[1]
Balance, shares at Sep. 30, 2024	43,664,677	43,664,677			19,504,664

[1] Amounts are net of tax.