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Long-Term Debt (Senior Notes Issuance - Narrative) (Details) - USD ($)
3 Months Ended
Jun. 30, 2020
Apr. 21, 2020
Mar. 31, 2020
Feb. 28, 2017
Senior Notes due March 1, 2025 [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 1,325,000,000   $ 1,325,000,000  
Stated interest rate 5.75%   5.75%  
Maturity date Mar. 01, 2025      
Senior Notes - Issuance 2 [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 325,000,000    
Senior Notes - Issuance 1 [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 1,000,000,000