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
Balance at Dec. 31, 2021					15,472,856
Stock issuance, net, shares		17,351
Cash dividends - per common share	(11.0)			(11.0)
Share-based employee compensation	2.6		2.6
Net earnings	44.4			44.4
Other comprehensive income (loss)	11.9					11.9
Acquisition of treasury stock	(30.0)				$ (30.0)
Acquisition of treasury stock, shares		301,005			(301,005)
Ending Balance at Mar. 31, 2022	537.6	$ 0.6	563.9	1,044.8	$ (974.0)	(97.7)	[1]
Balance at Mar. 31, 2022		47,018,645
Balance at Mar. 31, 2022					15,773,861
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
Balance at Dec. 31, 2022					17,364,635
Stock issuance, net, shares		12,328			(76)
Cash dividends - per common share	$ (11.7)			(11.7)
Share-based employee compensation	3.6		3.6
Net earnings	47.3			47.3
Other comprehensive income (loss)	(2.1)					(2.1)
Acquisition of treasury stock	(27.3)				$ (27.3)
Acquisition of treasury stock, shares		(367,269)			367,269
Ending Balance at Mar. 31, 2023	$ 544.8	$ 0.6	$ 577.2	$ 1,205.5	$ (1,136.3)	$ (102.2)	[1]
Balance at Mar. 31, 2023	45,217,244	45,217,244
Balance at Mar. 31, 2023					17,731,828

[1] Amounts are net of tax