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Noncontrolling Interests (Changes In Redeemable Noncontrolling Interest) (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Temporary Equity [Roll Forward]    
Beginning balance $ 127.6 $ 101.8
Initial fair value of redeemable noncontrolling interest of 3 Arts Entertainment 0.0 15.8
Net loss attributable to redeemable noncontrolling interests (14.1) (11.6)
Noncontrolling interests discount accretion 19.1 15.7
Adjustments to redemption value 20.8 24.4
Cash distributions (3.3) (1.8)
Ending balance $ 150.1 $ 144.3