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, 2014		14,513,821
Beginning balance at Dec. 31, 2014	$ 191.9	$ 14.5	$ 89.8	$ 126.5	$ (31.2)	$ (14.0)	$ 6.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	32.7			48.1		(16.0)	0.6
Share-based compensation	7.3		7.3
Restricted stock awards (in shares)		72,500
Restricted stock awards	0.0	$ 0.1	(0.1)
Restricted stock cancelled (in shares)		(29,836)
Restricted stock cancelled	0.0
Performance shares issued (in shares)		14,000
Performance shares issued	0.0
Exercise of stock options, Number of Shares (in shares)		83,500
Exercise of stock options	1.2	$ 0.1	1.1
Dividends	(6.3)			(6.3)
Purchase of treasury stock	(15.5)				(15.5)
Income tax effect of share-based compensation exercises and vesting	0.9		0.9
Ending balance (in shares) at Dec. 31, 2015		14,653,985
Ending 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
Share-based compensation	10.6		10.6
Restricted stock awards (in shares)		172,550
Restricted stock awards	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]
Comprehensive income (loss)	54.3			28.6		24.8	0.9
Share-based compensation	8.6		8.6
Restricted stock awards (in shares)		266,280
Restricted stock awards	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	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