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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net - current $ 522.0 $ 647.2
Accounts receivable, net - current, addition (reduction) (125.2)  
Accounts receivable, net - non-current 53.6 176.1
Accounts receivable, net - non-current, addition (reduction) (122.5)  
Contract asset - current 18.8 97.3
Contract asset - current, addition (reduction) (78.5)  
Contract asset - non-current 10.5 72.1
Contract asset - non-current, addition (reduction) (61.6)  
Deferred revenue - current 116.6 146.5
Deferred revenue - current, addition (reduction) (29.9)  
Deferred revenue - non-current 61.3 $ 62.8
Deferred revenue - non-current, addition (reduction) $ (1.5)