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Debt (2016 and 2018 Revolving Facility and 2016 Term Facility) (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 16, 2020
Dec. 31, 2019
Nov. 22, 2016
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,500,000,000    
Current portion of long-term debt $ 3,144,400,000   $ 1,457,600,000  
2016 Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 2,000,000,000.0
Line of Credit [Member] | Trailing Four Quarters [Member] | 2016 Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of Credit Facility, Covenant Terms 3.75 to 1.00