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Property and Casualty Insurance Reserves (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Liability for Unpaid Claims and Claims Adjustment Expense, Acquired, Net $ 682.9 $ 0.0
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 (1.7) 19.7
Total Incurred Losses and LAE 1,411.0 1,091.7
Paid Losses and LAE Related to Prior Years 535.3 446.6
Total Paid Losses and LAE 1,306.2 1,047.3
Property and Casualty Insurance Reserves - Net of Reinsurance and Indemnification at End of Period 1,751.4 925.6
Property and Casualty Insurance Reserves - Gross of Reinsurance and Indemnification at End of Period 1,819.1 968.5
Continuing Operations [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Current Year 1,412.7 1,072.0
Incurred Losses and LAE Related to Prior Years (1.2) 19.7
Paid Losses and LAE Related to Current Year 770.9 600.7
Paid Losses and LAE Related to Prior Years 533.1 443.6
Discontinued Operations [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (0.5) 0.0
Paid Losses and LAE Related to Prior Years 2.2 3.0
Personal Automobile [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (0.5) 18.1
Homeowners [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years 3.6 (0.1)
Other Personal Lines [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years (2.9) (0.3)
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 0.1 17.7
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 (1.8) 2.0
Catastrophe [Member] | Homeowners [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Incurred Losses and LAE Related to Prior Years   (3.2)
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 Recoverables at End of Period $ 67.7 $ 42.9