Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock	AOCI Attributable to Parent
Beginning Balance at Dec. 31, 2023	$ 591.8	$ 0.6	$ 591.7	$ 1,346.6	$ (1,242.4)	$ (104.7)	[1],[2]
Balance, shares at Dec. 31, 2023		43,902,061
Balance, shares at Dec. 31, 2023					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],[2]
Balance, shares at Sep. 30, 2024		43,664,677
Balance, shares at Sep. 30, 2024					19,504,664
Beginning Balance at Jun. 30, 2024	669.0	$ 0.6	595.1	1,447.5	$ (1,267.7)	(106.5)	[1],[2]
Balance, shares at Jun. 30, 2024		43,787,757
Balance, shares at Jun. 30, 2024					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],[2]
Balance, shares at Sep. 30, 2024		43,664,677
Balance, shares at Sep. 30, 2024					19,504,664
Beginning Balance at Dec. 31, 2024	$ 757.1	$ 0.6	604.0	1,560.7	$ (1,298.0)	(110.2)	[1],[2]
Balance, shares at Dec. 31, 2024	43,561,649	43,561,649
Balance, shares at Dec. 31, 2024	19,614,358				19,614,358
Stock issuance, net, shares		117,112
Cash dividends - per common share	$ (40.6)			(40.6)
Share-based employee compensation	8.2		8.2
Net earnings	243.2			243.2
Other comprehensive income (loss)	1.0					1.0
Acquisition of treasury stock	(79.7)				$ (79.7)
Acquisition of treasury stock, shares		(505,935)			505,935
Ending Balance at Sep. 30, 2025	$ 889.2	$ 0.6	612.2	1,763.3	$ (1,377.7)	(109.2)	[1],[2]
Balance, shares at Sep. 30, 2025	43,172,826	43,172,826
Balance, shares at Sep. 30, 2025	20,120,293				20,120,293
Beginning Balance at Jun. 30, 2025	$ 837.8	$ 0.6	605.9	1,690.6	$ (1,350.4)	(108.9)	[1],[2]
Balance, shares at Jun. 30, 2025		43,319,850
Balance, shares at Jun. 30, 2025					19,971,063
Stock issuance, net, shares		2,206
Cash dividends - per common share	(13.6)			(13.6)
Share-based employee compensation	6.3		6.3
Net earnings	86.3			86.3
Other comprehensive income (loss)	(0.3)					(0.3)
Acquisition of treasury stock	(27.3)				$ (27.3)
Acquisition of treasury stock, shares		(149,230)			149,230
Ending Balance at Sep. 30, 2025	$ 889.2	$ 0.6	$ 612.2	$ 1,763.3	$ (1,377.7)	$ (109.2)	[1],[2]
Balance, shares at Sep. 30, 2025	43,172,826	43,172,826
Balance, shares at Sep. 30, 2025	20,120,293				20,120,293

[1] Amounts are net of tax.

[2] Amounts include our 50% share of AOCL components from our WAVE joint venture.