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Revenue (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Revenue recognized $ 23.6 $ 128.8
Revenue recognized in period from performance obligations satisfied in previous period $ 64.6 $ 186.8
Timing of payment   60 days