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Additional Financial Information (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Additional Financial Information [Abstract]      
Reserve for returns and allowances on accounts receivable $ 68.6 $ 51.8  
Provision for doubtful accounts receivable 9.0 6.0  
Interest paid 79.8 42.7 $ 38.8
Income taxes paid $ 14.3 $ 10.2 $ 15.3