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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Millions
 6 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net - current $ 376.7 $ 522.0
Accounts receivable, net - current, Addition (Reduction) (145.3)  
Accounts receivable, net - non-current 37.2 53.6
Accounts receivable, net - non-current, Addition (Reduction) (16.4)  
Contract asset - current 23.0 18.8
Contract asset - current, Addition (Reduction) 4.2  
Contract asset - non-current 4.9 10.5
Contract asset - non-current, Addition (Reduction) (5.6)  
Deferred revenue - current 123.2 116.6
Deferred revenue - current, Addition (Reduction) 6.6  
Deferred revenue 53.5 $ 61.3
Deferred revenue - non-current, Addition (Reduction) $ (7.8)