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Noncontrolling Interests (Changes In Redeemable Noncontrolling Interests) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Increase (Decrease) in Temporary Equity [Roll Forward]      
Beginning balance $ 93.8 $ 90.5 $ 0.0
Initial fair value of redeemable noncontrolling interests 0.0 0.0 90.1
Net income (loss) attributable to noncontrolling interests 0.5 (0.3) (7.5)
Noncontrolling interest discount accretion 6.1 5.0 2.0
Adjustments to redemption value 9.3 5.5 5.9
Cash distributions (7.9) (6.9) 0.0
Ending balance $ 101.8 $ 93.8 $ 90.5