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Additional Financial Information (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Additional Financial Information [Abstract]      
Restricted cash $ 0.0 $ 0.0  
Provision for doubtful accounts receivable 9.3 5.4  
Interest paid 173.8 146.7 $ 119.7
Income Taxes Paid (Received), Net $ (5.3) $ 13.5 $ (20.3)