v2.4.0.6
Property and Casualty Insurance Reserves (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 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 (6.9) (1.7)
Total Incurred Losses and LAE 284.2 307.3
Paid Losses and LAE Related to Prior Years 185.2 201.7
Total Paid Losses and LAE 307.4 335.7
Property and Casualty Insurance Reserves - Net of Reinsurance and Indemnification at End of Period 931.4 1,012.2
Plus Reinsurance and Indemnification Recoverabe at End of Period 70.0 83.6
Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period 1,001.4 1,095.8
Segment, Continuing Operations [Member]
    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Current Year 291.1 309.0
Incurred Losses and LAE Related to Prior Years (5.7) (3.9)
Paid Losses and LAE Related to Current Year 122.2 134.0
Paid Losses and LAE Related to Prior Years 179.0 189.4
Segment, Discontinued Operations [Member]
    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (1.2) 2.2
Paid Losses and LAE Related to Prior Years 6.2 12.3
Personal Lines [Member]
    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years 0.4 (2.9)
Commercial Lines [Member]
    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (7.3) 1.2
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 (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 $ (1.2)