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Debt - Credit Facilities (Details)
1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 26, 2020
USD ($)
Jun. 25, 2020
USD ($)
Feb. 29, 2020
USD ($)
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 250,000,000   $ 250,000,000        
Revolving Credit Agreement              
Debt Instrument [Line Items]              
Credit Agreement term   5 years          
Long-term line of credit   $ 1,500,000,000         $ 3,000,000,000
Maximum borrowing capacity         $ 1,000,000,000 $ 1,500,000,000  
Debt covenants, net debt to consolidated EBITDA ratio   3.50          
Amount outstanding $ 0   0 $ 0      
Amount borrowed     $ 0 $ 0      
Revolving Credit Agreement | Period One              
Debt Instrument [Line Items]              
Debt covenants, net debt to consolidated EBITDA ratio 5.00            
Revolving Credit Agreement | Period Two              
Debt Instrument [Line Items]              
Debt covenants, net debt to consolidated EBITDA ratio 5.25            
Revolving Credit Agreement | Period Three              
Debt Instrument [Line Items]              
Debt covenants, net debt to consolidated EBITDA ratio 5.00            
Revolving Credit Agreement | Period Four              
Debt Instrument [Line Items]              
Debt covenants, net debt to consolidated EBITDA ratio 4.50            
Revolving Credit Agreement | Period Five              
Debt Instrument [Line Items]              
Debt covenants, net debt to consolidated EBITDA ratio 4.00            
Revolving Credit Agreement | Period Six              
Debt Instrument [Line Items]              
Debt covenants, net debt to consolidated EBITDA ratio 3.50