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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Contract with Customer, Schedule of Asset and Liability [Line Items]        
Accounts receivable, net - current $ 1,059.0 $ 1,059.0 $ 1,042.2 $ 946.0
Accounts receivable, net - non-current 266.4 [1] 266.4 [1] 257.7 [1] 325.2
Contract asset - current [2] 19.9 19.9 78.3  
Contract asset - non-current [3] 12.1 12.1 71.5  
Deferred revenue - current 238.0 238.0 183.8 $ 183.9
Deferred revenue - non-current 59.3 59.3 $ 70.5  
Contract with Customer, Liability, Revenue Recognized $ 33.0 105.2    
Accounts receivable, current        
Contract with Customer, Schedule of Asset and Liability [Line Items]        
Contract with Customer, Asset, Increase (Decrease)   16.8    
Accounts receivable, noncurrent        
Contract with Customer, Schedule of Asset and Liability [Line Items]        
Contract with Customer, Asset, Increase (Decrease) [1]   8.7    
Other Current Assets        
Contract with Customer, Schedule of Asset and Liability [Line Items]        
Contract with Customer, Asset, Increase (Decrease) [2]   (58.4)    
Other Non-Current Assets        
Contract with Customer, Schedule of Asset and Liability [Line Items]        
Contract with Customer, Asset, Increase (Decrease) [3]   (59.4)    
Deferred revenue, current        
Contract with Customer, Schedule of Asset and Liability [Line Items]        
Contract with Customer, Liability, Increase (Decrease)   54.2    
Deferred revenue, noncurrent        
Contract with Customer, Schedule of Asset and Liability [Line Items]        
Contract with Customer, Liability, Increase (Decrease)   $ (11.2)    
[1] Included in accounts receivable within non-current other assets in the unaudited condensed consolidated balance sheets.
[2] Included in prepaid expenses and other within other current assets in the unaudited condensed consolidated balance sheets.
[3] Included in prepaid expenses and other within non-current other assets in the unaudited condensed consolidated balance sheets.