Consolidated Statements of Equity - USD ($) $ in Millions	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Noncontrolling Interest [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	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, 2017								17,881,177
Balance at Dec. 31, 2017								$ 6.7	$ 15.1	$ 297.0	$ (22.3)	$ 296.5	$ 2.0	$ 298.5
Net Earnings (Loss)								0.0	0.0	33.4	0.0	33.4	0.1	33.5
Other Comprehensive (Loss) Income								$ 0.0	0.0	0.0	(14.9)	(14.9)	0.0	(14.9)
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (in shares)								244,024
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings								$ 0.1	5.1	0.0	0.0	5.2	0.0	5.2
Share-Based Compensation								0.0	8.3	0.0	0.0	8.3	0.0	8.3
Dividends paid per Common Share								0.0	0.0	(15.3)	0.0	(15.3)	0.0	(15.3)
Recognition of Noncontrolling Interests								$ 0.0	0.0	0.0	0.0	0.0	(0.2)	(0.2)
Balance (in shares) at Dec. 31, 2018								18,125,201
Balance at Dec. 31, 2018	$ 0.0	$ 0.0	$ 1.2	$ 0.0	$ 1.2	$ 0.0	$ 1.2	$ 6.8	28.5	316.3	(37.2)	314.4	1.9	316.3
Net Earnings (Loss)								0.0	0.0	45.8	0.0	45.8	0.1	45.9
Other Comprehensive (Loss) Income								$ 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 (in shares)								210,809
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings								$ 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)
Recognition 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						18,336,010
Balance at Dec. 31, 2019								$ 6.9	45.5	346.0	(38.5)	359.9	1.4	$ 361.3
Net Earnings (Loss)														33.7
Other Comprehensive (Loss) Income								$ 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 (in shares)								167,795
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings								$ 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)
Recognition 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)
Net Earnings								$ 0.0	0.0	33.7	0.0	33.7	0.0	$ 33.7
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