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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Millions
 9 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net - current $ 597.7 $ 647.2
Accounts receivable, net - current, Addition (Reduction) (49.5)  
Accounts receivable, net - non-current 82.3 176.1
Accounts receivable, net - non-current, Addition (Reduction) (93.8)  
Contract asset - current [1] 12.4 97.3
Contract asset - current, Addition (Reduction) [1] (84.9)  
Contract asset - non-current [1] 9.2 72.1
Contract asset - non-current, Addition (Reduction) [1] (62.9)  
Deferred revenue - current 141.4 146.5
Deferred revenue - current, Addition (Reduction) (5.1)  
Deferred revenue 60.4 $ 62.8
Deferred revenue - non-current, Addition (Reduction) $ (2.4)  
[1]
Included in prepaid expenses and other.