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Investments (Narratives) (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Insurance Regulatory Authorites:    
Assets held by insurance regulators $ 29.4 $ 30.8
Available for sale securities:    
Fair value of sold available for sale securites 124.8  
Available-for-sale securities, gross realized gains 3.6  
Available-for-sale securities, gross realized losses $ 0.2