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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Millions
 9 Months Ended
Dec. 31, 2020
Mar. 31, 2020
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net - current $ 386.4 $ 522.0
Accounts receivable, net - current, Addition (Reduction) (135.6)  
Accounts receivable, net - non-current 49.9 53.6
Accounts receivable, net - non-current, Addition (Reduction) (3.7)  
Contract asset - current 16.1 18.8
Contract asset - current, Addition (Reduction) (2.7)  
Contract asset - non-current 4.2 10.5
Contract asset - non-current, Addition (Reduction) (6.3)  
Deferred revenue - current 141.9 116.6
Deferred revenue - current, Addition (Reduction) 25.3  
Deferred revenue 54.2 $ 61.3
Deferred revenue - non-current, Addition (Reduction) $ (7.1)