Property and Casualty Insurance Reserves (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Property and Casulty Insurance Reserve - Gross of Reinsurance at Beginning of Year	$ 970.6	$ 1,029.1
Less Reinsurance and Indemnification Recoverables at Beginning of Year	66.2	74.5
Property and Casualty Insurance Reserves - Net of Reinsurance and Indemnification at Beginning of Year	904.4	954.6
Incurred Losses and LAE Related to Prior Years	(13.3)	(6.9)
Total Incurred Losses and LAE	256.3	284.2
Paid Losses and LAE Related to Prior Years	175.6	185.2
Total Paid Losses and LAE	287.4	307.4
Property and Casualty Insurance Reserves - Net of Reinsurance and Indemnification at End of Period	873.3	931.4
Plus Reinsurance and Indemnification Recoverabe at End of Period	69.0	70.0
Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period	942.3	1,001.4
Segment, Continuing Operations [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Current Year	269.6	291.1
Incurred Losses and LAE Related to Prior Years	(13.7)	(5.7)
Paid Losses and LAE Related to Current Year	111.8	122.2
Paid Losses and LAE Related to Prior Years	171.5	179.0
Segment, Discontinued Operations [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	0.4	(1.2)
Paid Losses and LAE Related to Prior Years	4.1	6.2
Personal Lines [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	(14.4)	0.4
Commercial Lines [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	1.1	(7.3)
Commercial Lines [Member] | Segment, Continuing Operations [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	0.7	(6.1)
Commercial Lines [Member] | Segment, Discontinued Operations [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	0.4	(1.2)
Personal Automobile [Member] | Personal Lines [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	(6.8)
Homeowners [Member] | Personal Lines [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	(6.2)
Other Personal Lines [Member] | Personal Lines [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	$ (1.4)