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Accounts Receivable - Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable, net $ 1,415.9   $ 2,891.9      
Accounts receivable, allowance for credit losses 48.6   35.5      
Cumulative transition adjustment to retained earnings $ 1,818.3 $ 1,815.6 1,893.9 $ 1,850.1 $ 1,855.8 $ 1,831.6
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member          
Percent accounts receivable outstanding, less than 60 days 91.00%          
Account receivable sold under the RPAs $ 92.6   $ 405.9      
Fees and financing costs under the RPA 5.5 13.3        
Accounts receivable sold under RPAs 2,200.0 4,200.0        
Cash proceeds from sale of accounts receivables $ 2,500.0 4,200.0        
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     3.00%      
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 $ 1,768.6 $ 1,669.7 1,761.3 $ 1,785.1 $ 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)