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Property and Casualty Insurance Reserves (Details) - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Property and Casulty Insurance Reserve - Gross of Reinsurance at Beginning of Year $ 862,800,000 $ 733,900,000
Less Reinsurance and Indemnification Recoverables at Beginning of Year 52,000,000 54,900,000
Property and Casualty Insurance Reserves - Net of Reinsurance and Indemnification at Beginning of Year 810,800,000 679,000,000
Property and Casualty Insurance Reserves Acquired, Net of Reinsurance and Indemnification 0 125,400,000
Incurred Losses and LAE Related to Prior Years (21,000,000) (16,300,000)
Total Incurred Losses and LAE 1,010,100,000 778,800,000
Paid Losses and LAE Related to Prior Years 366,100,000 301,300,000
Total Paid Losses and LAE 949,300,000 785,200,000
Property and Casualty Insurance Reserves - Net of Reinsurance and Indemnification at End of Period 871,600,000 798,000,000
Plus Reinsurance and Indemnification Recoverables at End of Period 49,100,000 54,900,000
Property and Casualty Insurance Reserves - Gross of Reinsurance and Indemnification at End of Period 920,700,000 852,900,000
Continuing Operations [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Current Year 1,031,100,000 795,100,000
Incurred Losses and LAE Related to Prior Years (17,700,000) (12,800,000)
Paid Losses and LAE Related to Current Year 583,200,000 483,900,000
Paid Losses and LAE Related to Prior Years 360,800,000 295,400,000
Discontinued Operations [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (3,300,000) (3,500,000)
Paid Losses and LAE Related to Prior Years 5,300,000 5,900,000
Personal Automobile [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years 7,300,000 (5,600,000)
Homeowners [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (18,100,000) (8,800,000)
Other Personal Lines [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (6,900,000) 900,000
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 (17,700,000) (13,500,000)
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 (3,300,000) (2,800,000)
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 0 700,000
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 (3,300,000) $ (3,500,000)
Catastrophe [Member] | Homeowners [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years $ (14,300,000)