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Property and Casualty Insurance Reserves (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Property and Casulty Insurance Reserve - Gross of Reinsurance at Beginning of Year $ 1,016.8 $ 931.4
Property and Casualty Insurance Reserves - Net of Reinsurance and Indemnification at Beginning of Year 963.7 881.2
Incurred Losses and LAE Related to Prior Years 1.6 18.9
Total Incurred Losses and LAE 743.9 740.8
Paid Losses and LAE Related to Prior Years 363.3 348.3
Total Paid Losses and LAE 698.4 703.3
Property and Casualty Insurance Reserves - Net of Reinsurance and Indemnification at End of Period 1,009.2 918.7
Property and Casualty Insurance Reserves - Gross of Reinsurance and Indemnification at End of Period 1,059.7 967.0
Continuing Operations [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Current Year 742.3 721.9
Incurred Losses and LAE Related to Prior Years 2.0 19.0
Paid Losses and LAE Related to Current Year 335.1 355.0
Paid Losses and LAE Related to Prior Years 361.6 346.3
Discontinued Operations [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (0.4) (0.1)
Paid Losses and LAE Related to Prior Years 1.7 2.0
Personal Automobile [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years 3.2 15.3
Homeowners [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years 1.9 (0.2)
Other Personal Lines [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (2.2) 0.5
Property and Casualty, Personal Insurance Product Line [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years 2.9 15.6
Property and Casualty, Commercial Insurance Product Line [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (1.3) 3.3
Property and Casualty, Commercial Insurance Product Line [Member] | Continuing Operations [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years   3.4
Property and Casualty, Commercial Insurance Product Line [Member] | Discontinued Operations [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years   (0.1)
Catastrophe [Member] | Homeowners [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (6.4) (2.4)
Property and Casualty Insurance [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Less Reinsurance and Indemnification Recoverables at Beginning of Year 53.1 50.2
Plus Reinsurance and Indemnification Recoverables at End of Period $ 50.5 $ 48.3