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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Millions
 9 Months Ended
Dec. 31, 2021
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net - current $ 415.2 $ 383.7
Accounts receivable, net - current, Addition (Reduction) 31.5  
Accounts receivable, net - non-current 47.1 49.4
Accounts receivable, net - non-current, Addition (Reduction) (2.3)  
Contract asset - current 45.1 25.6
Contract asset - current, Addition (Reduction) 19.5  
Contract asset - non-current 9.0 10.3
Contract asset - non-current, Addition (Reduction) (1.3)  
Deferred revenue - current 254.5 165.7
Deferred revenue - current, Addition (Reduction) 88.8  
Deferred revenue 44.0 $ 56.2
Deferred revenue - non-current, Addition (Reduction) $ (12.2)