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Accounts Receivable (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable, net of allowance       $ 2,891.9 $ 2,739.6
Activities in allowance for bad debt          
Account receivable sold $ 405.9 $ 508.2      
Fees and interest paid under RPA 25.9 19.9 $ 12.4    
Accounts receivable sold under repurchase agreement 8,200.0 7,900.0 6,100.0    
Amount collected of accounts receivables under repurchase agreement 8,200.0 7,900.0 5,900.0    
Maximum          
Activities in allowance for bad debt          
Sale price of receivables, percentage of sold amount       100.00%  
LIBOR | Minimum          
Activities in allowance for bad debt          
Receivable, basis spread on variable rate       1.00%  
LIBOR | Maximum          
Activities in allowance for bad debt          
Receivable, basis spread on variable rate       3.00%  
Allowance for bad debt          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for bad debt 39.4 27.8 24.9 $ 35.5 $ 39.4
Activities in allowance for bad debt          
Balance as of beginning of period 39.4 27.8 24.9    
Charges to provision for bad debt 25.9 25.1 9.3    
Write-off of uncollectible accounts receivable (32.2) (16.2) (8.7)    
Recoveries of bad debt 2.4 2.9 2.0    
Translation Adjustments 0.0 (0.1) 0.3    
Balance as of end of period $ 35.5 $ 39.4 $ 27.8