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Short-Term and Long-Term Borrowings - Narrative (Details) - USD ($)
1 Months Ended
May 31, 2022
Nov. 30, 2021
Jun. 30, 2022
Jun. 10, 2021
Senior Notes        
Debt Instrument [Line Items]        
Aggregate principal amount       $ 230,000,000
Proceeds from issuance of debt $ 90,000,000 $ 140,000,000    
Series 2021A Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (as a percent)     2.74%  
Series 2021A Senior Unsecured Notes | Senior Notes        
Debt Instrument [Line Items]        
Aggregate principal amount       $ 40,000,000
Interest rate (as a percent)       2.74%
Series 2021B Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (as a percent)     3.69%  
Series 2021B Senior Unsecured Notes | Senior Notes        
Debt Instrument [Line Items]        
Aggregate principal amount       $ 100,000,000
Interest rate (as a percent)       3.69%
Series 2022A Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (as a percent)     3.77%  
Series 2022A Senior Unsecured Notes | Senior Notes        
Debt Instrument [Line Items]        
Aggregate principal amount       $ 90,000,000
Interest rate (as a percent)       3.77%
Series 2007B Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (as a percent)     6.15%  
Minimum        
Debt Instrument [Line Items]        
Interest and dividend coverage ratio     1.50  
Maximum        
Debt Instrument [Line Items]        
Debt to total capitalization ratio     60.00%