v2.4.0.6
Property and Casualty Insurance Reserves (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Property and Casulty Insurance Reserve - Gross of Reinsurance at Beginning of Year $ 1,029.1 $ 1,118.7
Less Reinsurance and Indemnification Recoverables at Beginning of Year 74.5 78.1
Property and Casualty Insurance Reserves - Net of Reinsurance and Indemnification at Beginning of Year 954.6 1,040.6
Incurred Losses and LAE Related to Prior Years (23.7) (28.2)
Total Incurred Losses and LAE 901.3 1,010.2
Paid Losses and LAE Related to Prior Years 396.1 422.0
Total Paid Losses and LAE 941.1 1,058.7
Property and Casualty Insurance Reserves - Net of Reinsurance and Indemnification at End of Period 914.8 992.1
Plus Reinsurance and Indemnification Recoverabe at End of Period 67.0 71.5
Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period 981.8 1,063.6
Segment, Continuing Operations [Member]
    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Current Year 925.0 1,038.4
Incurred Losses and LAE Related to Prior Years (23.2) (30.1)
Paid Losses and LAE Related to Current Year 545.0 636.7
Paid Losses and LAE Related to Prior Years 382.0 399.9
Segment, Discontinued Operations [Member]
    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (0.5) 1.9
Paid Losses and LAE Related to Prior Years 14.1 22.1
Personal Lines [Member]
    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (10.4) (27.6)
Commercial Lines [Member]
    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (13.3) (0.6)
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 (12.8)  
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 (0.5)  
Personal Automobile [Member] | Personal Lines [Member]
    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years 3.5  
Homeowners [Member] | Personal Lines [Member]
    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (11.2)  
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 $ (2.7)