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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Millions
 6 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net - current $ 419.3 $ 383.7
Accounts receivable, net - current, Addition (Reduction) 35.6  
Accounts receivable, net - non-current 42.7 49.4
Accounts receivable, net - non-current, Addition (Reduction) (6.7)  
Contract asset - current 29.6 25.6
Contract asset - current, Addition (Reduction) 4.0  
Contract asset - non-current 13.7 10.3
Contract asset - non-current, Addition (Reduction) 3.4  
Deferred revenue - current 276.7 165.7
Deferred revenue - current, Addition (Reduction) 111.0  
Deferred revenue 49.0 $ 56.2
Deferred revenue - non-current, Addition (Reduction) $ (7.2)