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Investments (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]      
Assets held by insurance regulators $ 30.8    
Fair value of sold available-for-sale securities 264.5 $ 114.8 $ 163.7
Available-for-sale securities, gross realized gains 6.4 2.0 5.4
Available-for-sale securities, gross realized losses 0.2 $ 0.2 $ 0.3
Mortgages [Member]      
Investments, Debt and Equity Securities [Abstract]      
Other-than-temporary impairments $ 0.5    
Mortgages [Member] | Minimum [Member]      
Real Estate [Abstract]      
Mortgage loan interest rate 4.10%    
Debt instrument, maturity year 2020    
Mortgages [Member] | Maximum [Member]      
Real Estate [Abstract]      
Mortgage loan interest rate 8.20%    
Debt instrument, maturity year 2036