Consolidated Statement of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2015		14,653,985
Beginning balance at Dec. 31, 2015	$ 212.2	$ 14.7	$ 99.0	$ 168.3	$ (46.7)	$ (30.0)	$ 6.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	19.5			31.7		(12.7)	0.5
Stock-based compensation	10.6		10.6
Restricted stock awards (in shares)		172,550
Restricted stock awards issued	0.0	$ 0.2	(0.2)
Restricted stock cancelled (in shares)		(4,000)
Restricted stock cancelled	0.0
Performance shares issued (in shares)		1,500
Performance shares issued	0.0
Exercise of stock options, Number of Shares (in shares)		22,000
Exercise of stock options	0.5		0.5
Dividends	(6.2)			(6.2)
Purchase of treasury stock	(1.9)				(1.9)
Income tax effect of share-based compensation exercises and vesting	(0.6)		(0.6)
Acquisition and adjustments	2.1						2.1
Other	(0.2)		(0.5)	(0.2)			0.5
Ending balance (in shares) at Dec. 31, 2016		14,846,035
Ending balance at Dec. 31, 2016	$ 236.0	$ 14.9	108.8	193.6	(48.6)	(42.7)	10.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend per common share (in dollars per share)	$ 0.50
Comprehensive income (loss)	$ 54.3			28.6		24.8	0.9
Stock-based compensation	8.6		8.6
Restricted stock awards (in shares)		266,280
Restricted stock awards issued	0.0	$ 0.3	(0.3)
Restricted stock cancelled (in shares)		(2,000)
Restricted stock cancelled	0.0
Performance shares issued (in shares)		4,694
Performance shares issued	0.0
Exercise of stock options, Number of Shares (in shares)		38,000
Exercise of stock options	0.7		0.7
Dividends	(6.9)			(6.3)			(0.6)
Purchase of treasury stock	(6.6)				(6.6)
Acquisition and adjustments	1.7						1.7
Other	0.2			0.2
Ending balance (in shares) at Dec. 31, 2017		15,153,009
Ending balance at Dec. 31, 2017	$ 288.0	$ 15.2	117.8	216.1	(55.2)	(17.9)	12.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend per common share (in dollars per share)	$ 0.50
Comprehensive income (loss)	$ 32.2			53.6		(23.0)	1.6
Stock-based compensation	8.3		8.3
Restricted stock awards (in shares)		410,100
Restricted stock awards issued	0.0	$ 0.4	(0.4)
Restricted stock cancelled (in shares)		(7,834)
Restricted stock cancelled	0.0
Dividends	(6.4)			(6.4)
Purchase of treasury stock	(12.1)				(12.1)
Ending balance (in shares) at Dec. 31, 2018		15,555,275
Ending balance at Dec. 31, 2018	$ 312.6	$ 15.6	$ 125.7	$ 265.9	$ (67.3)	$ (40.9)	$ 13.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend per common share (in dollars per share)	$ 0.50