Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained (Deficit) Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2019		37,679,000
Beginning Balance at Dec. 31, 2019	$ 175.5	$ 0.4	$ 189.7	$ (20.4)	$ 2.8	$ 3.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	1.0		1.0
Issuance of restricted stock (in shares)		36,000
Issuance of restricted stock	0.0		(0.6)	0.6
Stock withheld for employee taxes (in shares)		(15,000)
Stock withheld for employee taxes	(0.3)			(0.3)
Proceeds from issuance of common stock (in shares)		30,000
Proceeds from issuance of common stock	0.3		(0.2)	0.5
Issuance of shares under employee stock purchase plan (in shares)		23,000
Issuance of shares under employee stock purchase plan	0.4		0.4
Dividends	$ (43.3)				(43.3)
Purchase of treasury shares (in shares)	(233,249)	(233,000)
Purchase of treasury shares	$ (3.9)			(3.9)
Change in cumulative translation adjustment	(0.2)					(0.2)
Net income	8.2				8.2
Ending Balance (in shares) at Mar. 31, 2020		37,520,000
Ending Balance at Mar. 31, 2020	137.7	$ 0.4	190.3	(23.5)	(32.3)	2.8
Beginning Balance (in shares) at Dec. 31, 2020		37,552,000
Beginning Balance 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	0.4		0.4
Issuance of restricted stock (in shares)		65,000
Issuance of restricted stock	0.0		(1.1)	1.1
Stock withheld for employee taxes (in shares)		(47,000)
Stock withheld for employee taxes	(1.9)			(1.9)
Proceeds from issuance of common stock (in shares)		119,000
Proceeds from issuance of common stock	2.3		(0.2)	2.5
Issuance of shares under employee stock purchase plan (in shares)		29,000
Issuance of shares under employee stock purchase plan	0.5		0.5
Dividends	$ (6.0)				(6.0)
Purchase of treasury shares (in shares)	0
Change in cumulative translation adjustment	$ 0.1					0.1
Net income	15.2				15.2
Ending Balance (in shares) at Mar. 31, 2021		37,718,000
Ending Balance at Mar. 31, 2021	$ 117.4	$ 0.4	$ 193.1	$ (22.3)	$ (57.3)	$ 3.5