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Noncontrolling Interests (Changes In Redeemable Noncontrolling Interest) (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Increase (Decrease) in Temporary Equity [Roll Forward]    
Beginning balance $ 93.8 $ 90.5
Net income (loss) attributable to noncontrolling interest 0.3 (0.2)
Noncontrolling interest discount accretion 4.5 3.8
Adjustments to redemption value 5.4 6.1
Cash distributions (5.5) (5.9)
Ending balance $ 98.5 $ 94.3