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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net - current $ 383.7 $ 522.0
Accounts receivable, net - current, addition (reduction) (138.3)  
Accounts receivable, net - non-current 49.4 53.6
Accounts receivable, net - non-current, addition (reduction) (4.2)  
Contract asset - current 25.6 18.8
Contract asset - current, addition (reduction) 6.8  
Contract asset - non-current 10.3 10.5
Contract asset - non-current, addition (reduction) (0.2)  
Deferred revenue - current 165.7 116.6
Deferred revenue - current, addition (reduction) 49.1  
Deferred revenue - non-current 56.2 $ 61.3
Deferred revenue - non-current, addition (reduction) $ (5.1)