Property and Casualty Insurance Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Beginning Property and Casualty Insurance Reserves: [Abstract]
Gross of Reinsurance at Beginning of Year	$ 733.9	$ 843.5	$ 970.6
Less Reinsurance Recoverables at Beginning of Year	54.9	63.4	66.2
Property and Casualty Insurance Reserves, Net of Reinsurance at Beginning of Year	679.0	780.1	904.4
Property and Casualty Insurance Reserves Acquired, Net of Reinsurance and Indemnification					$ 125.4	$ 0.0	$ 0.0
Incurred Losses and LAE related to:
Prior Years - Incurred Losses and LAE	(20.1)	(57.1)	(64.6)
Total Incurred Losses and LAE	1,103.2	908.3	991.9
Paid Losses and LAE related to:
Prior Years - Paid Losses and LAE	373.6	369.6	434.0
Total Paid Losses and LAE	1,096.8	1,009.4	1,116.2
Property and Casualty Insurance Reserves, Net of Reinsurance and Indemnification at End of Year	679.0	780.1	904.4	$ 810.8	$ 679.0	$ 780.1	$ 904.4
Plus Reinsurance and Indemnification Recoverables at End of Year	52.0	54.9	63.4
Property and Casualty Insurance Reserves, Gross of Reinsurance at End of Year	862.8	733.9	843.5
Personal Lines [Member]
Incurred Losses and LAE related to:
Prior Years - Incurred Losses and LAE	(13.3)	(50.9)	(56.8)
Property and Casualty, Personal Insurance Product Line, Excluding Alliance United [Member]
Incurred Losses and LAE related to:
Prior Years - Incurred Losses and LAE	(21.0)
Commercial Lines [Member]
Incurred Losses and LAE related to:
Prior Years - Incurred Losses and LAE	(6.8)	(6.2)	(7.8)
Continuing Operations [Member]
Incurred Losses and LAE related to:
Current Year - Incurred Losses and LAE	1,123.3	965.4	1,056.5
Prior Years - Incurred Losses and LAE	(11.5)	(53.5)	59.8
Paid Losses and LAE related to:
Current Year - Paid Losses and LAE	723.2	639.8	682.2
Prior Years - Paid Losses and LAE	366.2	360.4	421.7
Continuing Operations [Member] | Commercial Lines [Member]
Incurred Losses and LAE related to:
Prior Years - Incurred Losses and LAE	1.8	(2.6)	(3.0)
Discontinued Operations [Member]
Incurred Losses and LAE related to:
Prior Years - Incurred Losses and LAE	(8.6)	(3.6)	4.8
Paid Losses and LAE related to:
Prior Years - Paid Losses and LAE	7.4	9.2	12.3
Discontinued Operations [Member] | Commercial Lines [Member]
Incurred Losses and LAE related to:
Prior Years - Incurred Losses and LAE	(8.6)	(3.6)	(4.8)
Personal Automobile [Member] | Personal Lines [Member]
Incurred Losses and LAE related to:
Prior Years - Incurred Losses and LAE	(1.8)	(31.6)	(30.1)
Homeowners [Member] | Personal Lines [Member]
Incurred Losses and LAE related to:
Prior Years - Incurred Losses and LAE	(10.8)	(14.8)	(20.1)
Other Personal Lines [Member] | Personal Lines [Member]
Incurred Losses and LAE related to:
Prior Years - Incurred Losses and LAE	(0.7)	$ (4.5)	$ (6.6)
Alliance United [Member]
Incurred Losses and LAE related to:
Prior Years - Incurred Losses and LAE	$ 7.7