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Property and Casualty Insurance Reserves (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Beginning Property and Casualty Insurance Reserves: [Abstract]            
Gross of Reinsurance and Indemnification at Beginning of Year $ 1,016.8 $ 931.4 $ 862.8      
Less Reinsurance Recoverables and Indemnification at Beginning of Year 111.6          
Property and Casualty Insurance Reserves, Net of Reinsurance at Beginning of Year 963.7 881.2 810.8      
Property and Casualty Insurance Reserves Acquired, Net of Reinsurance       $ 695.1 $ 0.0 $ 0.0
Incurred Losses and LAE related to:            
Prior Years - Incurred Losses and LAE (7.4) 18.9 (20.7)      
Total Incurred Losses and LAE 2,086.0 1,473.0 1,337.9      
Paid Losses and LAE related to:            
Prior Years - Paid Losses and LAE 671.0 522.4 436.5      
Total Paid Losses and LAE 1,971.8 1,390.5 1,267.5      
Property and Casualty Insurance Reserves, Net of Reinsurance and Indemnification at End of Year 963.7 881.2 810.8 $ 1,773.0 $ 963.7 $ 881.2
Plus Reinsurance and Indemnification Recoverables at End of Year 158.3 111.6        
Property and Casualty Insurance Reserves, Gross of Reinsurance at End of Year 1,874.9 1,016.8 931.4      
Continuing Operations [Member]            
Incurred Losses and LAE related to:            
Current Year - Incurred Losses and LAE 2,093.4 1,454.1 1,358.6      
Prior Years - Incurred Losses and LAE (5.2) 20.4 (14.4)      
Paid Losses and LAE related to:            
Current Year - Paid Losses and LAE 1,300.8 868.1 831.0      
Prior Years - Paid Losses and LAE 668.2 518.5 431.9      
Discontinued Operations [Member]            
Incurred Losses and LAE related to:            
Prior Years - Incurred Losses and LAE (2.2) (1.5) (6.3)      
Paid Losses and LAE related to:            
Prior Years - Paid Losses and LAE 2.8 3.9 4.6      
Catastrophe [Member]            
Incurred Losses and LAE related to:            
Prior Years - Incurred Losses and LAE (8.4) (4.5) (19.3)      
Total Incurred Losses and LAE 87.6 180.4 95.8      
Property and Casualty Insurance [Member]            
Beginning Property and Casualty Insurance Reserves: [Abstract]            
Less Reinsurance Recoverables and Indemnification at Beginning of Year 53.1 50.2 52.0      
Paid Losses and LAE related to:            
Plus Reinsurance and Indemnification Recoverables at End of Year 101.9 53.1 50.2      
Property and Casualty, Personal Insurance Product Line [Member]            
Incurred Losses and LAE related to:            
Prior Years - Incurred Losses and LAE (1.4) 19.5 (16.8)      
Property and Casualty, Commercial Insurance Product Line [Member]            
Incurred Losses and LAE related to:            
Prior Years - Incurred Losses and LAE (6.1) (0.6) (3.9)      
Property and Casualty, Commercial Insurance Product Line [Member] | Continuing Operations [Member]            
Incurred Losses and LAE related to:            
Prior Years - Incurred Losses and LAE (3.9) 0.9 2.4      
Property and Casualty, Commercial Insurance Product Line [Member] | Discontinued Operations [Member]            
Incurred Losses and LAE related to:            
Prior Years - Incurred Losses and LAE (2.2) (1.5) (6.3)      
Personal Automobile [Member]            
Incurred Losses and LAE related to:            
Prior Years - Incurred Losses and LAE 5.8 22.2 11.3      
Homeowners [Member]            
Incurred Losses and LAE related to:            
Prior Years - Incurred Losses and LAE 3.2 1.0 (20.0)      
Homeowners [Member] | Catastrophe [Member]            
Incurred Losses and LAE related to:            
Prior Years - Incurred Losses and LAE   (3.7) (16.8)      
Other Personal Lines [Member]            
Incurred Losses and LAE related to:            
Prior Years - Incurred Losses and LAE $ (4.3) $ (3.7) $ (8.1)