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Interest Rate Swap Agreements (Narrative) (Details) - USD ($)
9 Months Ended
Apr. 24, 2019
Sep. 30, 2020
Sep. 30, 2019
Oct. 31, 2018
Derivative [Line Items]        
Debt redeemed   $ 1,647,354,000 $ 888,951,000  
Interest Rate Swap [Member]        
Derivative [Line Items]        
Interest rate swap       $ 850,000,000
Face Amount $ 900,000,000      
Debt redeemed 313,500,000      
Loss on derivative $ 83,520,000