CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Treasury Stock, At Cost	Retained (Deficit) Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balances (in shares) at Dec. 31, 2020		37,552,000
Beginning balances at Dec. 31, 2020	$ 106.8	$ 0.4	$ 193.5	$ (24.0)	$ (66.5)	$ 3.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2.9		2.9
Issuance of restricted stock (in shares)		78,000
Issuance of restricted stock	0.0		(1.3)	1.3
Stock withheld for employee taxes (in shares)		(77,000)
Stock withheld for employee taxes	(3.0)			(3.0)
Proceeds from issuance of common stock (in shares)		246,000
Proceeds from issuance of common stock	4.9		(0.4)	5.3
Dividends	(62.3)				(62.3)
Issuance of shares under employee stock purchase plan (in shares)		55,000
Issuance of shares under employee stock purchase plan	1.1		1.1
Change in cumulative translation adjustment	(0.1)					(0.1)
Net income	103.3				103.3
Ending balances (in shares) at Dec. 31, 2021		37,854,000
Ending balances at Dec. 31, 2021	153.6	$ 0.4	195.8	(20.4)	(25.5)	3.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	4.5		4.5
Issuance of restricted stock (in shares)		32,000
Issuance of restricted stock	0.0		(0.6)	0.6
Stock withheld for employee taxes (in shares)		(12,000)
Stock withheld for employee taxes	(0.4)			(0.4)
Proceeds from issuance of common stock (in shares)		34,000
Proceeds from issuance of common stock	0.8		0.1	0.7
Dividends	(27.4)				(27.4)
Issuance of shares under employee stock purchase plan (in shares)		53,000
Issuance of shares under employee stock purchase plan	1.4		1.4
Change in cumulative translation adjustment	(0.9)					(0.9)
Net income	$ 78.8				78.8
Ending balances (in shares) at Dec. 31, 2022	37,960,605	37,961,000
Ending balances 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	3.0		3.0
Issuance of restricted stock (in shares)		44,000
Issuance of restricted stock	0.0		(0.7)	0.7
Stock withheld for employee taxes (in shares)		(19,000)
Stock withheld for employee taxes	(0.5)		(0.2)	(0.3)
Proceeds from issuance of common stock (in shares)		29,000
Proceeds from issuance of common stock	0.6		0.1	0.5
Dividends	(30.6)				(30.6)
Issuance of shares under employee stock purchase plan (in shares)		59,000
Issuance of shares under employee stock purchase plan	1.4		1.4
Change in cumulative translation adjustment	0.2					0.2
Net income	$ 70.7				70.7
Ending balances (in shares) at Dec. 31, 2023	38,074,344	38,074,000
Ending balances at Dec. 31, 2023	$ 255.2	$ 0.4	$ 204.8	$ (18.6)	$ 66.0	$ 2.6