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Noncontrolling Interests (Changes In Redeemable Noncontrolling Interest) (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Increase (Decrease) in Temporary Equity [Roll Forward]    
Beginning balance $ 93.8 $ 90.5
Net income (loss) attributable to noncontrolling interest 0.0 (0.3)
Noncontrolling interest discount accretion 2.9 2.5
Adjustments to redemption value 5.1 3.6
Cash distributions (4.6) (3.3)
Ending balance $ 97.2 $ 93.0