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Revenue (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]    
Contract with Customer, Liability, Revenue Recognized $ 32.4 $ 99.8
Revenue recognized in period from performance obligations satisfied in previous period $ 50.1 $ 115.0