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Accounts Receivable (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Accounts receivable          
Accounts receivable, net of allowance       $ 2,739.6 $ 2,705.6
Beneficial interest retained, percentage of accounts receivable       10.00%  
Account receivable sold $ 508.2 $ 377.3      
Retained beneficial interest 0.0 15.9      
Fees and interest paid under RPA 19.9 12.4 $ 4.8    
Accounts receivable sold under repurchase agreement 7,900.0 6,100.0 3,000.0    
Amount collected of accounts receivables under repurchase agreement 7,900.0 5,900.0 2,900.0    
Minimum          
Accounts receivable          
Sale price of receivables, percentage of sold amount       90.00%  
Minimum | LIBOR          
Accounts receivable          
Receivable, basis spread on variable rate       1.00%  
Maximum          
Accounts receivable          
Sale price of receivables, percentage of sold amount       100.00%  
Maximum | LIBOR          
Accounts receivable          
Receivable, basis spread on variable rate       3.00%  
Allowance for bad debt          
Accounts receivable          
Allowance for bad debt 39.4 27.8 24.9 $ 39.4 $ 27.8
Activities in allowance for bad debt          
Balance as of beginning of period 27.8 24.9 25.0    
Charges to provision for bad debt 25.1 9.3 15.4    
Write-off of uncollectible accounts receivable (16.2) (8.7) (15.9)    
Recoveries of bad debt 2.9 2.0 0.3    
Translation Adjustments (0.1) 0.3 0.2    
Balance as of end of period $ 39.4 $ 27.8 $ 24.9