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Debt - Credit Facilities (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Mar. 31, 2020
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 26, 2020
USD ($)
Jun. 25, 2020
USD ($)
Feb. 29, 2020
USD ($)
Debt Instrument [Line Items]              
Maximum borrowing capacity     $ 100,000,000        
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          
Increase in maximum common stock dividends and share repurchases allowed     $ 150,000,000        
Maximum consolidated net debt to consolidated EBITDA ratio     3.75        
Amount outstanding     $ 0 $ 0      
Amount borrowed     0 $ 0      
Revolving Credit Agreement | Any quarter ending on or prior to December 31, 2020              
Debt Instrument [Line Items]              
Debt covenants, net debt to consolidated EBITDA ratio 5.00            
Revolving Credit Agreement | Quarter ending March 31, 2021              
Debt Instrument [Line Items]              
Debt covenants, net debt to consolidated EBITDA ratio 5.25            
Revolving Credit Agreement | Quarter ending June 30, 2021              
Debt Instrument [Line Items]              
Debt covenants, net debt to consolidated EBITDA ratio 5.00            
Maximum common stock dividends and share repurchases     100,000,000        
Revolving Credit Agreement | Quarter ending September 30, 2021              
Debt Instrument [Line Items]              
Debt covenants, net debt to consolidated EBITDA ratio 4.50            
Revolving Credit Agreement | Quarter ending December 31, 2021              
Debt Instrument [Line Items]              
Debt covenants, net debt to consolidated EBITDA ratio 4.00            
Revolving Credit Agreement | All periods thereafter              
Debt Instrument [Line Items]              
Debt covenants, net debt to consolidated EBITDA ratio 3.50            
Maximum common stock dividends and share repurchases     $ 250,000,000