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Short-Term Borrowings (Narrative) (Details) - USD ($)
$ in Millions
Apr. 17, 2019
Dec. 31, 2020
Apr. 01, 2020
Dec. 31, 2019
Short-term Debt [Line Items]        
Commercial paper outstanding   $ 503.0   $ 570.0
Line of Credit Facility, Amount Outstanding   0.0   0.0
Accounts receivable securitization facility borrowings   0.0   353.2
Commercial Paper        
Short-term Debt [Line Items]        
Revolving credit facility, maximum   1,500.0    
Revolving Credit Facility        
Short-term Debt [Line Items]        
Revolving credit facility, maximum   1,850.0    
Term Loan        
Short-term Debt [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 0.60%      
Term Loan   $ 0.0   $ 850.0
Maximum | Term Loan        
Short-term Debt [Line Items]        
Term Loan $ 850.0   $ 850.0