CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Common Stock	Additional Paid In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2023		33,587,701
Accumulated gain at beginning of period at Dec. 31, 2023	$ 670.3	$ 0.3	$ 244.7	$ 693.8	$ (302.2)	$ 33.7
Beginning balance, treasury stock (in shares) at Dec. 31, 2023					(5,220,363)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	55.9			55.9
Issuance of common stock awards to employees (in shares)		70,629
Surrender of common stock awards (in shares)					(1,409)
Surrender of common stock awards	(0.2)				$ (0.2)
Share-based compensation expense	3.8		3.8
Share-based compensation issued to directors	0.2		0.2
Dividends declared	$ (55.5)			(55.5)
Common stock repurchase, inclusive of excise tax obligation (in shares)	0
Other comprehensive income (loss), net of tax	$ 4.7					4.7
Ending balance (in shares) at Mar. 31, 2024		33,658,330
Accumulated gain at end of period at Mar. 31, 2024	$ 679.2	$ 0.3	248.7	694.2	$ (302.4)	38.4
Ending balance, treasury stock (in shares) at Mar. 31, 2024					(5,221,772)
Beginning balance (in shares) at Dec. 31, 2024	33,713,662	33,713,662
Accumulated gain at beginning of period at Dec. 31, 2024	$ 705.3	$ 0.3	261.3	865.5	$ (456.8)	35.0
Beginning balance, treasury stock (in shares) at Dec. 31, 2024	(5,955,171)				(5,955,171)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 45.4			45.4
Issuance of common stock awards to employees (in shares)		36,932
Surrender of common stock awards (in shares)					(523)
Share-based compensation expense	5.4		5.4
Share-based compensation issued to directors	0.2		0.2
Issuance of award previously classified as liability awards (in shares)		15,499
Issuance of awards previously classified as liability awards	1.5		1.5
Dividends declared	$ (57.3)			(57.3)
Common stock repurchase, inclusive of excise tax obligation (in shares)	(200,000)				(200,000)
Common stock repurchase, inclusive of excise tax obligation	$ (34.3)				$ (34.3)
Other comprehensive income (loss), net of tax	$ (5.3)					(5.3)
Ending balance (in shares) at Mar. 31, 2025	33,766,093	33,766,093
Accumulated gain at end of period at Mar. 31, 2025	$ 660.9	$ 0.3	$ 268.4	$ 853.6	$ (491.1)	$ 29.7
Ending balance, treasury stock (in shares) at Mar. 31, 2025	(6,155,694)				(6,155,694)