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SENIOR NOTES PAYABLE Narrative (Details) - Senior Notes - USD ($)
Mar. 31, 2020
May 31, 2017
Jul. 31, 2016
Mar. 31, 2012
Senior Notes Due 2024        
Debt Instrument [Line Items]        
Debt Instrument, face amount       $ 250,000,000
Stated interest rate       5.625%
Percentage of principal amount of notes redeemed       100.00%
Basis spread used in determining redemption price       0.50%
Senior Notes Due 2026        
Debt Instrument [Line Items]        
Debt Instrument, face amount     $ 500,000,000  
Stated interest rate     3.625%  
Percentage of principal amount of notes redeemed     100.00%  
Basis spread used in determining redemption price     0.35%  
Senior Notes Due 2030        
Debt Instrument [Line Items]        
Debt Instrument, face amount $ 500,000,000      
Stated interest rate 4.65%      
Percentage of principal amount of notes redeemed 100.00%      
Basis spread used in determining redemption price 0.50%      
Senior Notes Due 2046        
Debt Instrument [Line Items]        
Debt Instrument, face amount   $ 300,000,000 $ 300,000,000  
Stated interest rate   4.95% 4.95%  
Percentage of principal amount of notes redeemed   100.00%    
Basis spread used in determining redemption price     0.45%  
Senior Notes Due 2046, Additional        
Debt Instrument [Line Items]        
Debt Instrument, face amount   $ 500,000,000