Consolidated Statements of Equity - USD ($) $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2018	18,125,201
Balance at Dec. 31, 2018	$ 6.8	$ 28.5	$ 316.3	$ (37.2)	$ 314.4	$ 1.9	$ 316.3
Net income (loss)	0.0	0.0	45.8	0.0	45.8	0.1	45.9
Other comprehensive income (loss)	$ 0.0	0.0	0.0	(1.3)	(1.3)	0.0	(1.3)
Issue stock for directors, employee benefit and stock plans, net of related tax withholdings of shares (in shares)	210,809
Issue stock for directors, employee benefit and stock plans, net of related tax withholdings of shares	$ 0.1	5.1	0.0	0.0	5.2	0.0	5.2
Share-based compensation	0.0	11.4	0.0	0.0	11.4	0.0	11.4
Dividends paid per common share	0.0	0.0	(16.0)	0.0	(16.0)	0.0	(16.0)
Purchase of noncontrolling interests	0.0	0.5	0.0	0.0	0.5	(0.5)	0.0
Other	$ 0.0	0.0	(0.1)	0.0	(0.1)	(0.1)	(0.2)
Balance (in shares) at Dec. 31, 2019	18,336,010
Balance at Dec. 31, 2019	$ 6.9	45.5	346.0	(38.5)	359.9	1.4	361.3
Net income (loss)	0.0	0.0	33.7	0.0	33.7	0.0	33.7
Other comprehensive income (loss)	$ 0.0	0.0	0.0	18.4	18.4	0.0	18.4
Issue stock for directors, employee benefit and stock plans, net of related tax withholdings of shares (in shares)	167,795
Issue stock for directors, employee benefit and stock plans, net of related tax withholdings of shares	$ 0.0	3.3	0.0	0.0	3.3	0.0	3.3
Share-based compensation	0.0	6.0	0.0	0.0	6.0	0.0	6.0
Dividends paid per common share	0.0	0.0	(16.3)	0.0	(16.3)	0.0	(16.3)
Purchase of noncontrolling interests	0.0	(0.1)	0.0	0.0	(0.1)	0.0	(0.1)
Other	$ 0.0	0.0	(0.1)	0.0	(0.1)	(0.1)	$ (0.2)
Repurchases of common stock (in shares)							0
Balance (in shares) at Dec. 31, 2020	18,503,805						18,503,805
Balance at Dec. 31, 2020	$ 6.9	54.7	363.3	(20.1)	404.8	1.3	$ 406.1
Net income (loss)	0.0	0.0	64.9	0.0	64.9	0.0	64.9
Other comprehensive income (loss)	$ 0.0	0.0	0.0	(17.8)	(17.8)	0.0	(17.8)
Issue stock for directors, employee benefit and stock plans, net of related tax withholdings of shares (in shares)	228,293
Issue stock for directors, employee benefit and stock plans, net of related tax withholdings of shares	$ 0.1	4.9	0.0	0.0	5.0	0.0	5.0
Share-based compensation	0.0	9.5	0.0	0.0	9.5	0.0	9.5
Dividends paid per common share	0.0	0.0	(17.5)	0.0	(17.5)	0.0	(17.5)
Other	$ 0.0	0.0	(0.1)	0.0	(0.1)	0.0	$ (0.1)
Repurchases of common stock (in shares)	(196,982)						(196,982)
Repurchases of common stock	$ 0.0	(15.0)	0.0	0.0	(15.0)	0.0	$ (15.0)
Balance (in shares) at Dec. 31, 2021	18,535,116						15,535,116
Balance at Dec. 31, 2021	$ 7.0	$ 54.1	$ 410.6	$ (37.9)	$ 433.8	$ 1.3	$ 435.1