Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - 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, 2017		15,153,009
Balance at beginning of period 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]
Other comprehensive income	15.7			9.8		5.5	0.4
Stock-based compensation expense	2.2		2.2
Stock-based compensation activity (shares)		12,000
Stock-based compensation activity	0.0
Dividends	(1.6)			(1.6)
Purchases of treasury stock (27,069 and 26,917 shares, respectively)	(1.1)				(1.1)
Payments of withholding taxes on share awards	(1.0)				(1.0)
Ending balance (in shares) at Mar. 31, 2018		15,165,009
Balance at end of period at Mar. 31, 2018	304.8	$ 15.2	120.0	226.9	(57.3)	(12.4)	12.4
Beginning balance (in shares) at Dec. 31, 2017		15,153,009
Balance at beginning of period 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]
Other comprehensive income	20.4
Ending balance (in shares) at Jun. 30, 2018		15,551,459
Balance at end of period at Jun. 30, 2018	$ 308.3	$ 15.6	122.0	240.1	(59.3)	(22.7)	12.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends per common share (in dollars per share)	$ 0.250
Beginning balance (in shares) at Mar. 31, 2018		15,165,009
Balance at beginning of period at Mar. 31, 2018	$ 304.8	$ 15.2	120.0	226.9	(57.3)	(12.4)	12.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income	4.7			14.8		(10.3)	0.2
Stock-based compensation expense	2.4		2.4
Stock-based compensation activity (shares)		386,450
Stock-based compensation activity	0.0	$ 0.4	(0.4)
Dividends	(1.6)			(1.6)
Payments of withholding taxes on share awards	(2.0)				(2.0)
Ending balance (in shares) at Jun. 30, 2018		15,551,459
Balance at end of period at Jun. 30, 2018	$ 308.3	$ 15.6	122.0	240.1	(59.3)	(22.7)	12.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends per common share (in dollars per share)	$ 0.125
Beginning balance (in shares) at Dec. 31, 2018		15,555,275
Balance at beginning of period 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]
Other comprehensive income	17.7			11.2		6.0	0.5
Stock-based compensation expense	1.9		1.9
Stock-based compensation activity (shares)		38,000
Stock-based compensation activity	0.0
Dividends	(1.9)			(1.6)			(0.3)
Payments of withholding taxes on share awards	(1.0)				(1.0)
Ending balance (in shares) at Mar. 31, 2019		15,593,275
Balance at end of period at Mar. 31, 2019	329.3	$ 15.6	127.6	275.5	(68.3)	(34.9)	13.8
Beginning balance (in shares) at Dec. 31, 2018		15,555,275
Balance at beginning of period 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]
Other comprehensive income	23.5
Ending balance (in shares) at Jun. 30, 2019		15,517,725
Balance at end of period at Jun. 30, 2019	$ 330.2	$ 15.5	127.5	281.5	(71.0)	(37.0)	13.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends per common share (in dollars per share)	$ 0.250
Beginning balance (in shares) at Mar. 31, 2019		15,593,275
Balance at beginning of period at Mar. 31, 2019	$ 329.3	$ 15.6	127.6	275.5	(68.3)	(34.9)	13.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income	5.8			7.6		(2.1)	0.3
Stock-based compensation expense	(0.2)		(0.2)
Stock-based compensation activity, forfeited (shares)		(75,550)
Stock-based compensation activity	0.0	$ (0.1)	0.1
Dividends	(2.0)			(1.6)			(0.4)
Purchases of treasury stock (27,069 and 26,917 shares, respectively)	(0.9)				(0.9)
Payments of withholding taxes on share awards	(1.8)				(1.8)
Ending balance (in shares) at Jun. 30, 2019		15,517,725
Balance at end of period at Jun. 30, 2019	$ 330.2	$ 15.5	$ 127.5	$ 281.5	$ (71.0)	$ (37.0)	$ 13.7