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Leases (Narrative) (Details) - USD ($)
$ in Millions
 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Lessee, Lease, Description [Line Items]    
Change in finance lease right-of-use asset from reclassifcation $ (42.0) $ 0.0
Change in finance lease liability due to a reassessment event (48.6) 0.0
Change in operating lease right-of-use asset from reclassifcation 6.0 0.0
Change in operating lease liability due to a reassessment event $ 12.6 $ 0.0
Maximum    
Lessee, Lease, Description [Line Items]    
Leases, remaining lease term 10 years