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Investments (Narratives) (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2017
Regulatory Capital Requirements [Abstract]      
Assets held by insurance regulators $ 30.2   $ 16.8
Fair value of sold available-for-sale securities 101.2    
Available-for-sale securities, gross realized gains 3.8    
Available-for-sale securities, gross realized losses 0.1    
Other-than-temporary impairments $ 0.0 $ 0.0