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Noncontrolling Interests (Changes In Redeemable Noncontrolling Interest) (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Increase (Decrease) in Temporary Equity [Roll Forward]    
Beginning balance $ 101.8 $ 93.8
Initial fair value of redeemable noncontrolling interest of 3 Arts Entertainment 15.8 0.0
Net income (loss) attributable to redeemable noncontrolling interests (7.4) 0.0
Noncontrolling interests discount accretion 9.4 2.9
Adjustments to redemption value 15.0 5.1
Cash distributions (1.5) (4.6)
Ending balance $ 133.1 $ 97.2