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Accounts Receivable - Narrative (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accounts receivable $ 1,200.0   $ 2,900.0          
Accounts receivable, allowance for credit losses 51.8   35.5          
Cumulative transition adjustment to retained earnings $ 1,919.8 $ 1,858.6 1,893.9 $ 1,818.3 $ 1,850.1 $ 1,815.6 $ 1,855.8 $ 1,831.6
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member              
Percent accounts receivable outstanding, less than 60 days 92.00%              
Account receivable sold under the RPAs $ 166.7   $ 405.9          
Fees and financing costs under the RPA 6.8 20.4            
Cash proceeds from sale of accounts receivables 2,900.0 6,300.0            
Accounts receivable sold under RPAs $ 2,600.0 6,300.0            
Maximum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Sale price of receivables, percentage of sold amount 100.00%              
London Interbank Offered Rate (LIBOR) | Maximum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Receivable, basis spread on variable rate     3.25%          
London Interbank Offered Rate (LIBOR) | Minimum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Receivable, basis spread on variable rate     1.00%          
Cumulative Effect, Period of Adoption, Adjustment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Cumulative transition adjustment to retained earnings     $ (11.1)          
Retained Earnings                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Cumulative transition adjustment to retained earnings $ 1,846.6 $ 1,711.4 1,761.3 $ 1,768.6 $ 1,785.1 $ 1,669.7 $ 1,639.3 $ 1,606.1
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Cumulative transition adjustment to retained earnings     $ (11.1)