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Debt (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]          
Weighted average interest rate     2.28%    
Balance spread on variable rate 73.00%        
Long-term Debt, Gross $ 468   $ 468    
Required consolidated leverage ratio 5.0   5.0    
Required consolidated leverage ratio temporary 1 5.5   5.5    
Long-term Debt, Gross $ 468   $ 468    
Required consolidated leverage ratio 5.0   5.0    
Required consolidated leverage ratio temporary 1 5.5   5.5    
Debt maximum borrowing capacity $ 600   $ 600    
Balance spread on variable rate 73.00%        
Long-term Debt [Member]          
Line of Credit Facility [Line Items]          
Weighted average interest rate 118.00%   191.00%    
Domestic Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Weighted average interest rate         3.25%
Line of Credit | Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Outstanding borrowing $ 468,000,000   $ 468,000,000   $ 468,000,000
Interest expense $ 1,500,000 $ 4,100,000 $ 7,100,000 $ 12,300,000  
Commitment fee percentage         0.10%
Utilization fee percentage         0.20%