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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Contract with Customer, Schedule of Asset and Liability [Line Items]      
Accounts receivable, net - current $ 1,044.1 $ 1,042.2 $ 946.0
Accounts receivable, net - non-current 285.8 [1] 257.7 [1] 325.2
Contract asset - current [2] 22.5 78.3  
Contract asset - non-current [3] 12.7 71.5  
Deferred revenue - current 202.5 183.8 $ 183.9
Deferred revenue - non-current 61.3 $ 70.5  
Contract with Customer, Liability, Revenue Recognized 72.3    
Accounts receivable, current      
Contract with Customer, Schedule of Asset and Liability [Line Items]      
Contract with Customer, Asset, Increase (Decrease) 1.9    
Accounts receivable, noncurrent      
Contract with Customer, Schedule of Asset and Liability [Line Items]      
Contract with Customer, Asset, Increase (Decrease) [1] 28.1    
Other Current Assets      
Contract with Customer, Schedule of Asset and Liability [Line Items]      
Contract with Customer, Asset, Increase (Decrease) [2] (55.8)    
Other Non-Current Assets      
Contract with Customer, Schedule of Asset and Liability [Line Items]      
Contract with Customer, Asset, Increase (Decrease) [3] (58.8)    
Deferred revenue, current      
Contract with Customer, Schedule of Asset and Liability [Line Items]      
Contract with Customer, Liability, Increase (Decrease) 18.7    
Deferred revenue, noncurrent      
Contract with Customer, Schedule of Asset and Liability [Line Items]      
Contract with Customer, Liability, Increase (Decrease) $ (9.2)    
[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.