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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net - current $ 442.2 $ 383.7
Accounts receivable, net - current, addition (reduction) 58.5  
Accounts receivable, net - non-current 39.0 49.4
Accounts receivable, net - non-current, addition (reduction) (10.4)  
Contract asset - current 40.5 25.6
Contract asset - current, addition (reduction) 14.9  
Contract asset - non-current 9.3 10.3
Contract asset - non-current, addition (reduction) (1.0)  
Deferred revenue - current 174.9 165.7
Deferred revenue - current, addition (reduction) 9.2  
Deferred revenue - non-current 49.8 $ 56.2
Deferred revenue - non-current, addition (reduction) $ (6.4)