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Revolving Credit Facility (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 23, 2016
Apr. 30, 2020
Oct. 31, 2020
Mar. 31, 2020
Minimum | Eurodollar        
Line of Credit Facility [Line Items]        
Debt instrument, basis spread on variable rate     0.69%  
Minimum | Fed Funds Effective Rate Overnight Index Swap Rate        
Line of Credit Facility [Line Items]        
Debt instrument, basis spread on variable rate     0.00%  
Maximum | Eurodollar        
Line of Credit Facility [Line Items]        
Debt instrument, basis spread on variable rate     1.375%  
Maximum | Fed Funds Effective Rate Overnight Index Swap Rate        
Line of Credit Facility [Line Items]        
Debt instrument, basis spread on variable rate     0.375%  
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Debt instrument, term 5 years      
Line of credit facility, maximum borrowing capacity $ 1,250,000,000      
Borrowing       $ 350,000,000.0
Repayments of short-term debt   $ 350,000,000.0    
Interest expense, debt   $ 600,000    
Long-term debt     $ 0  
Debt instrument, covenant, leverage ratio     3.5  
Debt instrument, covenant with major change, leverage ratio     4.0  
Unsecured revolving credit facility, covenant compliance     compliant with these covenants