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Fair Value of Financial Instruments - Measured on Recurring Basis (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Assets                
Fixed maturity securities $ 3,812.6   $ 3,812.6     $ 3,391.6    
Equity securities 143.2   143.2     200.5    
Liabilities                
Liabilities accounted for at fair value 8.3 $ 4.2 8.3 $ 4.2 $ 8.8 11.9 $ 4.1 $ 4.8
Transfer into Level 3 7.2 14.7 117.8 24.6        
U.S. Government and government agencies                
Assets                
Fixed maturity securities 18.5   18.5     25.4    
States, municipalities and political subdivisions                
Assets                
Fixed maturity securities 442.5   442.5     421.9    
Liabilities                
Transfer into Level 3 4.2 0.0 4.2 0.4        
Residential mortgage-backed securities                
Assets                
Fixed maturity securities 80.1   80.1     94.4    
Liabilities                
Transfer into Level 3 0.0 5.6 0.0 5.5        
Commercial mortgage-backed securities                
Assets                
Fixed maturity securities 106.4   106.4     93.9    
Liabilities                
Transfer into Level 3 0.0 0.0 0.0 0.0        
Asset-backed securities                
Assets                
Fixed maturity securities 526.2   526.2     511.5    
Liabilities                
Transfer into Level 3 0.0 0.0 5.6 0.0        
Corporate and other                
Assets                
Fixed maturity securities 2,638.9   2,638.9     2,244.5    
Liabilities                
Transfer into Level 3 0.0 9.1 105.0 15.7        
Common Stock                
Assets                
Equity securities 22.8   22.8     15.0    
Liabilities                
Transfer into Level 3 0.0 0.0 0.0 0.4        
Perpetual preferred stocks                
Assets                
Equity securities 120.4   120.4     185.5    
Liabilities                
Transfer into Level 3 3.0 0.0 3.0 2.6        
Embedded derivative                
Liabilities                
Liabilities accounted for at fair value 2.9   2.9   6.1 8.4    
Other                
Liabilities                
Liabilities accounted for at fair value 5.4 $ 4.2 5.4 4.2 $ 2.7 3.5 $ 4.1 $ 4.8
Equity securities                
Liabilities                
Transfer into Level 3     73.7 $ 12.3        
Recurring                
Assets                
Fixed maturity securities 3,812.6   3,812.6     3,391.6    
Equity securities 143.2   143.2     200.5    
Total assets 3,955.8   3,955.8     3,592.1    
Liabilities                
Other 0.4   0.4     3.5    
Liabilities accounted for at fair value 8.3   8.3     11.9    
Recurring | Level 1                
Assets                
Fixed maturity securities 21.4   21.4     12.7    
Equity securities 25.3   25.3     16.3    
Total assets 46.7   46.7     29.0    
Liabilities                
Other           0.0    
Liabilities accounted for at fair value 0.0   0.0     0.0    
Recurring | Level 2                
Assets                
Fixed maturity securities 3,137.9   3,137.9     2,738.5    
Equity securities 55.9   55.9     123.0    
Total assets 3,193.8   3,193.8     2,861.5    
Liabilities                
Other           0.0    
Liabilities accounted for at fair value 0.0   0.0     0.0    
Recurring | Level 3                
Assets                
Fixed maturity securities 653.3   653.3     640.4    
Equity securities 62.0   62.0     61.2    
Total assets 715.3   715.3     701.6    
Liabilities                
Other           3.5    
Liabilities accounted for at fair value 8.3   8.3     11.9    
Recurring | U.S. Government and government agencies                
Assets                
Fixed maturity securities 18.5   18.5     25.4    
Recurring | U.S. Government and government agencies | Level 1                
Assets                
Fixed maturity securities 4.1   4.1     6.1    
Recurring | U.S. Government and government agencies | Level 2                
Assets                
Fixed maturity securities 14.4   14.4     19.3    
Recurring | U.S. Government and government agencies | Level 3                
Assets                
Fixed maturity securities 0.0   0.0     0.0    
Recurring | States, municipalities and political subdivisions                
Assets                
Fixed maturity securities 442.5   442.5     421.9    
Recurring | States, municipalities and political subdivisions | Level 1                
Assets                
Fixed maturity securities 0.0   0.0     0.0    
Recurring | States, municipalities and political subdivisions | Level 2                
Assets                
Fixed maturity securities 438.8   438.8     421.9    
Recurring | States, municipalities and political subdivisions | Level 3                
Assets                
Fixed maturity securities 3.7   3.7     0.0    
Recurring | Residential mortgage-backed securities                
Assets                
Fixed maturity securities 80.1   80.1     94.4    
Recurring | Residential mortgage-backed securities | Level 1                
Assets                
Fixed maturity securities 0.0   0.0     0.0    
Recurring | Residential mortgage-backed securities | Level 2                
Assets                
Fixed maturity securities 67.6   67.6     75.4    
Recurring | Residential mortgage-backed securities | Level 3                
Assets                
Fixed maturity securities 12.5   12.5     19.0    
Recurring | Commercial mortgage-backed securities                
Assets                
Fixed maturity securities 106.4   106.4     93.9    
Recurring | Commercial mortgage-backed securities | Level 1                
Assets                
Fixed maturity securities 0.0   0.0     0.0    
Recurring | Commercial mortgage-backed securities | Level 2                
Assets                
Fixed maturity securities 40.0   40.0     35.7    
Recurring | Commercial mortgage-backed securities | Level 3                
Assets                
Fixed maturity securities 66.4   66.4     58.2    
Recurring | Asset-backed securities                
Assets                
Fixed maturity securities 526.2   526.2     511.5    
Recurring | Asset-backed securities | Level 1                
Assets                
Fixed maturity securities 0.0   0.0     0.0    
Recurring | Asset-backed securities | Level 2                
Assets                
Fixed maturity securities 113.6   113.6     33.3    
Recurring | Asset-backed securities | Level 3                
Assets                
Fixed maturity securities 412.6   412.6     478.2    
Recurring | Corporate and other                
Assets                
Fixed maturity securities 2,638.9   2,638.9     2,244.5    
Recurring | Corporate and other | Level 1                
Assets                
Fixed maturity securities 17.3   17.3     6.6    
Recurring | Corporate and other | Level 2                
Assets                
Fixed maturity securities 2,463.5   2,463.5     2,152.9    
Recurring | Corporate and other | Level 3                
Assets                
Fixed maturity securities 158.1   158.1     85.0    
Recurring | Common Stock                
Assets                
Equity securities 22.8   22.8     15.0    
Recurring | Common Stock | Level 1                
Assets                
Equity securities 17.9   17.9     9.1    
Recurring | Common Stock | Level 2                
Assets                
Equity securities 0.0   0.0     0.0    
Recurring | Common Stock | Level 3                
Assets                
Equity securities 4.9   4.9     5.9    
Recurring | Perpetual preferred stocks                
Assets                
Equity securities 120.4   120.4     185.5    
Recurring | Perpetual preferred stocks | Level 1                
Assets                
Equity securities 7.4   7.4     7.2    
Recurring | Perpetual preferred stocks | Level 2                
Assets                
Equity securities 55.9   55.9     123.0    
Recurring | Perpetual preferred stocks | Level 3                
Assets                
Equity securities 57.1   57.1     55.3    
Recurring | Embedded derivative                
Liabilities                
Embedded derivative 2.9   2.9     8.4    
Recurring | Embedded derivative | Level 1                
Liabilities                
Embedded derivative 0.0   0.0     0.0    
Recurring | Embedded derivative | Level 2                
Liabilities                
Embedded derivative 0.0   0.0     0.0    
Recurring | Embedded derivative | Level 3                
Liabilities                
Embedded derivative 2.9   2.9     $ 8.4    
Recurring | Other                
Liabilities                
Other 5.4   5.4          
Recurring | Other | Level 1                
Liabilities                
Other 0.0   0.0          
Recurring | Other | Level 2                
Liabilities                
Other 0.0   0.0          
Recurring | Other | Level 3                
Liabilities                
Other $ 5.4   $ 5.4