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Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Assets        
Fixed maturity securities, available-for-sale at fair value $ 3,753.0 $ 4,028.9    
Equity securities 72.4 92.5    
Liabilities        
Other 0.2      
Total liabilities accounted for at fair value 4.4 7.8 $ 8.8 $ 11.9
U.S. Government and government agencies        
Assets        
Fixed maturity securities, available-for-sale at fair value 8.8 7.7    
States, municipalities and political subdivisions        
Assets        
Fixed maturity securities, available-for-sale at fair value 427.4 440.1    
Residential mortgage-backed securities        
Assets        
Fixed maturity securities, available-for-sale at fair value 61.0 66.9    
Commercial mortgage-backed securities        
Assets        
Fixed maturity securities, available-for-sale at fair value 99.7 109.4    
Asset-backed securities        
Assets        
Fixed maturity securities, available-for-sale at fair value 541.2 577.8    
Corporate and other        
Assets        
Fixed maturity securities, available-for-sale at fair value 2,614.9 2,827.0    
Perpetual preferred stocks        
Assets        
Equity securities 62.7 82.0    
Common Stock        
Assets        
Equity securities 9.7 10.5    
Recurring        
Assets        
Fixed maturity securities, available-for-sale at fair value 3,753.0 4,028.9    
Equity securities 72.4 92.5    
Total assets accounted for at fair value 3,825.4 4,121.4    
Liabilities        
Embedded derivative 0.7 3.0    
Other 3.7 4.8    
Total liabilities accounted for at fair value 4.4 7.8    
Recurring | Level 1        
Assets        
Fixed maturity securities, available-for-sale at fair value 37.4 51.3    
Equity securities 10.7 12.1    
Total assets accounted for at fair value 48.1 63.4    
Liabilities        
Embedded derivative 0.0 0.0    
Other 0.0 0.0    
Total liabilities accounted for at fair value 0.0 0.0    
Recurring | Level 2        
Assets        
Fixed maturity securities, available-for-sale at fair value 3,205.2 3,272.2    
Equity securities 20.1 22.8    
Total assets accounted for at fair value 3,225.3 3,295.0    
Liabilities        
Embedded derivative 0.0 0.0    
Other 0.0 0.0    
Total liabilities accounted for at fair value 0.0 0.0    
Recurring | Level 3        
Assets        
Fixed maturity securities, available-for-sale at fair value 510.4 705.4    
Equity securities 41.6 57.6    
Total assets accounted for at fair value 552.0 763.0    
Liabilities        
Embedded derivative 0.7 3.0    
Other 3.7 4.8    
Total liabilities accounted for at fair value 4.4 7.8    
Recurring | U.S. Government and government agencies        
Assets        
Fixed maturity securities, available-for-sale at fair value 8.8 7.7    
Recurring | U.S. Government and government agencies | Level 1        
Assets        
Fixed maturity securities, available-for-sale at fair value 5.5 4.8    
Recurring | U.S. Government and government agencies | Level 2        
Assets        
Fixed maturity securities, available-for-sale at fair value 3.3 2.9    
Recurring | U.S. Government and government agencies | Level 3        
Assets        
Fixed maturity securities, available-for-sale at fair value 0.0 0.0    
Recurring | States, municipalities and political subdivisions        
Assets        
Fixed maturity securities, available-for-sale at fair value 427.4 440.1    
Recurring | States, municipalities and political subdivisions | Level 1        
Assets        
Fixed maturity securities, available-for-sale at fair value 0.0 0.0    
Recurring | States, municipalities and political subdivisions | Level 2        
Assets        
Fixed maturity securities, available-for-sale at fair value 418.4 440.1    
Recurring | States, municipalities and political subdivisions | Level 3        
Assets        
Fixed maturity securities, available-for-sale at fair value 9.0 0.0    
Recurring | Residential mortgage-backed securities        
Assets        
Fixed maturity securities, available-for-sale at fair value 61.0 66.9    
Recurring | Residential mortgage-backed securities | Level 1        
Assets        
Fixed maturity securities, available-for-sale at fair value 0.0 0.0    
Recurring | Residential mortgage-backed securities | Level 2        
Assets        
Fixed maturity securities, available-for-sale at fair value 48.0 57.7    
Recurring | Residential mortgage-backed securities | Level 3        
Assets        
Fixed maturity securities, available-for-sale at fair value 13.0 9.2    
Recurring | Commercial mortgage-backed securities        
Assets        
Fixed maturity securities, available-for-sale at fair value 99.7 109.4    
Recurring | Commercial mortgage-backed securities | Level 1        
Assets        
Fixed maturity securities, available-for-sale at fair value 0.0 0.0    
Recurring | Commercial mortgage-backed securities | Level 2        
Assets        
Fixed maturity securities, available-for-sale at fair value 65.5 74.8    
Recurring | Commercial mortgage-backed securities | Level 3        
Assets        
Fixed maturity securities, available-for-sale at fair value 34.2 34.6    
Recurring | Asset-backed securities        
Assets        
Fixed maturity securities, available-for-sale at fair value 541.2 577.8    
Recurring | Asset-backed securities | Level 1        
Assets        
Fixed maturity securities, available-for-sale at fair value 0.0 0.0    
Recurring | Asset-backed securities | Level 2        
Assets        
Fixed maturity securities, available-for-sale at fair value 255.7 27.2    
Recurring | Asset-backed securities | Level 3        
Assets        
Fixed maturity securities, available-for-sale at fair value 285.5 550.6    
Recurring | Corporate and other        
Assets        
Fixed maturity securities, available-for-sale at fair value 2,614.9 2,827.0    
Recurring | Corporate and other | Level 1        
Assets        
Fixed maturity securities, available-for-sale at fair value 31.9 46.5    
Recurring | Corporate and other | Level 2        
Assets        
Fixed maturity securities, available-for-sale at fair value 2,414.3 2,669.5    
Recurring | Corporate and other | Level 3        
Assets        
Fixed maturity securities, available-for-sale at fair value 168.7 111.0    
Recurring | Perpetual preferred stocks        
Assets        
Equity securities 62.7 82.0    
Recurring | Perpetual preferred stocks | Level 1        
Assets        
Equity securities 4.4 5.0    
Recurring | Perpetual preferred stocks | Level 2        
Assets        
Equity securities 20.1 22.8    
Recurring | Perpetual preferred stocks | Level 3        
Assets        
Equity securities 38.2 54.2    
Recurring | Common Stock        
Assets        
Equity securities 9.7 10.5    
Recurring | Common Stock | Level 1        
Assets        
Equity securities 6.3 7.1    
Recurring | Common Stock | Level 2        
Assets        
Equity securities 0.0 0.0    
Recurring | Common Stock | Level 3        
Assets        
Equity securities $ 3.4 $ 3.4