Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2022		37,961
Beginning balance at Dec. 31, 2022	$ 210.4	$ 0.4	$ 201.2	$ (19.5)	$ 25.9	$ 2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	0.6		0.6
Issuance of restricted stock (in shares)		36
Issuance of restricted stock	0.0		(0.6)	0.6
Stock withheld for employee taxes (in shares)		(14)
Stock withheld for employee taxes	(0.4)		(0.1)	(0.3)
Proceeds from issuance of common stock (in shares)		3
Proceeds from issuance of common stock	0.1		0.0	0.1
Issuance of shares under employee stock purchase plan (in shares)		31
Issuance of shares under employee stock purchase plan	0.7		0.7
Dividends	(7.7)				(7.7)
Change in cumulative translation adjustment	0.1					0.1
Net income	13.2				13.2
Ending balance (in shares) at Mar. 31, 2023		38,017
Ending balance at Mar. 31, 2023	217.0	$ 0.4	201.8	(19.1)	31.4	2.5
Beginning balance (in shares) at Dec. 31, 2022		37,961
Beginning balance at Dec. 31, 2022	210.4	$ 0.4	201.2	(19.5)	25.9	2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in cumulative translation adjustment	0.3
Net income	34.7
Ending balance (in shares) at Jun. 30, 2023		38,031
Ending balance at Jun. 30, 2023	231.8	$ 0.4	202.3	(18.9)	45.3	2.7
Beginning balance (in shares) at Mar. 31, 2023		38,017
Beginning balance at Mar. 31, 2023	217.0	$ 0.4	201.8	(19.1)	31.4	2.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	0.6		0.6
Issuance of restricted stock (in shares)		8
Issuance of restricted stock	0.0		(0.1)	0.1
Stock withheld for employee taxes (in shares)		(2)
Stock withheld for employee taxes	(0.1)		(0.1)	(0.0)
Proceeds from issuance of common stock (in shares)		8
Proceeds from issuance of common stock	0.2		0.1	0.1
Dividends	(7.6)				(7.6)
Change in cumulative translation adjustment	0.2					0.2
Net income	21.5				21.5
Ending balance (in shares) at Jun. 30, 2023		38,031
Ending balance at Jun. 30, 2023	231.8	$ 0.4	202.3	(18.9)	45.3	2.7
Beginning balance (in shares) at Dec. 31, 2023		38,074
Beginning balance at Dec. 31, 2023	255.2	$ 0.4	204.8	(18.6)	66.0	2.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	1.0		1.0
Issuance of restricted stock (in shares)		66
Issuance of restricted stock	0.0		(1.2)	1.2
Stock withheld for employee taxes (in shares)		(37)
Stock withheld for employee taxes	(1.5)		(0.8)	(0.7)
Proceeds from issuance of common stock (in shares)		50
Proceeds from issuance of common stock	1.3		0.4	0.9
Issuance of shares under employee stock purchase plan (in shares)		28
Issuance of shares under employee stock purchase plan	0.8		0.8
Dividends	(9.6)				(9.6)
Change in cumulative translation adjustment	(0.2)					(0.2)
Net income	13.2				13.2
Ending balance (in shares) at Mar. 31, 2024		38,181
Ending balance at Mar. 31, 2024	260.2	$ 0.4	205.0	(17.2)	69.6	2.4
Beginning balance (in shares) at Dec. 31, 2023		38,074
Beginning balance at Dec. 31, 2023	255.2	$ 0.4	204.8	(18.6)	66.0	2.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in cumulative translation adjustment	(0.4)
Net income	33.5
Ending balance (in shares) at Jun. 30, 2024		38,187
Ending balance at Jun. 30, 2024	270.4	$ 0.4	204.6	(17.1)	80.3	2.2
Beginning balance (in shares) at Mar. 31, 2024		38,181
Beginning balance at Mar. 31, 2024	260.2	$ 0.4	205.0	(17.2)	69.6	2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	(0.4)		(0.4)
Issuance of restricted stock (in shares)		4
Issuance of restricted stock	0.0		(0.1)	0.1
Proceeds from issuance of common stock (in shares)		2
Proceeds from issuance of common stock	0.1		0.1
Dividends	(9.6)				(9.6)
Change in cumulative translation adjustment	(0.2)					(0.2)
Net income	20.3				20.3
Ending balance (in shares) at Jun. 30, 2024		38,187
Ending balance at Jun. 30, 2024	$ 270.4	$ 0.4	$ 204.6	$ (17.1)	$ 80.3	$ 2.2