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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Assets    
AFS securities $ 129.6 $ 129.9
Cash equivalents 124.1 127.0
Total assets at fair value 253.7 256.9
U.S. Treasury securities and agencies    
Assets    
AFS securities 23.1 23.3
Municipal securities    
Assets    
AFS securities 19.7 20.6
Corporate debt securities    
Assets    
AFS securities 48.7 48.7
Residential mortgage-backed securities    
Assets    
AFS securities 2.7 3.5
Commercial mortgage backed securities    
Assets    
AFS securities 31.9 30.3
Other debt obligations    
Assets    
AFS securities 3.0 3.5
Total fixed maturities    
Assets    
AFS securities 129.1 129.9
Short-term investments    
Assets    
AFS securities 0.5  
Level 1    
Assets    
Cash equivalents 124.1 127.0
Total assets at fair value 146.4 149.6
Level 1 | U.S. Treasury securities and agencies    
Assets    
AFS securities 22.3 22.6
Level 1 | Municipal securities    
Assets    
AFS securities 0.0 0.0
Level 1 | Corporate debt securities    
Assets    
AFS securities 0.0 0.0
Level 1 | Residential mortgage-backed securities    
Assets    
AFS securities 0.0 0.0
Level 1 | Commercial mortgage backed securities    
Assets    
AFS securities 0.0 0.0
Level 1 | Other debt obligations    
Assets    
AFS securities 0.0 0.0
Level 1 | Total fixed maturities    
Assets    
AFS securities 22.3 22.6
Level 1 | Short-term investments    
Assets    
AFS securities 0.0  
Level 2    
Assets    
Cash equivalents 0.0 0.0
Total assets at fair value 107.3 107.3
Level 2 | U.S. Treasury securities and agencies    
Assets    
AFS securities 0.8 0.7
Level 2 | Municipal securities    
Assets    
AFS securities 19.7 20.6
Level 2 | Corporate debt securities    
Assets    
AFS securities 48.7 48.7
Level 2 | Residential mortgage-backed securities    
Assets    
AFS securities 2.7 3.5
Level 2 | Commercial mortgage backed securities    
Assets    
AFS securities 31.9 30.3
Level 2 | Other debt obligations    
Assets    
AFS securities 3.0 3.5
Level 2 | Total fixed maturities    
Assets    
AFS securities 106.8 107.3
Level 2 | Short-term investments    
Assets    
AFS securities 0.5  
Level 3    
Assets    
Cash equivalents 0.0 0.0
Total assets at fair value 0.0 0.0
Level 3 | U.S. Treasury securities and agencies    
Assets    
AFS securities 0.0 0.0
Level 3 | Municipal securities    
Assets    
AFS securities 0.0 0.0
Level 3 | Corporate debt securities    
Assets    
AFS securities 0.0 0.0
Level 3 | Residential mortgage-backed securities    
Assets    
AFS securities 0.0 0.0
Level 3 | Commercial mortgage backed securities    
Assets    
AFS securities 0.0 0.0
Level 3 | Other debt obligations    
Assets    
AFS securities 0.0 0.0
Level 3 | Total fixed maturities    
Assets    
AFS securities 0.0 $ 0.0
Level 3 | Short-term investments    
Assets    
AFS securities $ 0.0