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Subsequent Event (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2020
Jan. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Obligations [Abstract]          
Repayment of debt obligations     $ 56,716.5 $ 77,957.1 $ 68,459.6
Summary of Derivative Instruments [Abstract]          
Payment on the settlement of interest rate derivative instruments     0.0 (22.1) (30.6)
Forward Starting Swaps [Member] | Derivatives in cash flow hedging relationships [Member]          
Summary of Derivative Instruments [Abstract]          
Notional amount of settled derivative instruments       275.0 275.0
Payment on the settlement of interest rate derivative instruments       (22.1) $ (30.6)
Senior Notes [Member]          
Debt Obligations [Abstract]          
Aggregate debt principal issued     $ 2,500.0 $ 5,000.0  
Forecast [Member] | Senior Notes [Member] | EPO Senior Notes Y due September 2020 [Member]          
Debt Obligations [Abstract]          
Repayment of debt obligations $ 1,000.0        
Subsequent Event [Member] | Forward Starting Swaps [Member] | Derivatives in cash flow hedging relationships [Member]          
Summary of Derivative Instruments [Abstract]          
Notional amount of settled derivative instruments   $ 575.0      
Payment on the settlement of interest rate derivative instruments   33.3      
Subsequent Event [Member] | Senior Notes [Member]          
Debt Obligations [Abstract]          
Aggregate debt principal issued   3,000.0      
Subsequent Event [Member] | Senior Notes [Member] | EPO Senior Notes AAA due January 2030 [Member]          
Debt Obligations [Abstract]          
Aggregate debt principal issued   $ 1,000.0      
Interest rate, stated percentage   2.80%      
Debt issued as percent of principal amount   99.921%      
Subsequent Event [Member] | Senior Notes [Member] | EPO Senior Notes BBB due January 2051 [Member]          
Debt Obligations [Abstract]          
Aggregate debt principal issued   $ 1,000.0      
Interest rate, stated percentage   3.70%      
Debt issued as percent of principal amount   99.413%      
Subsequent Event [Member] | Senior Notes [Member] | EPO Senior Notes CCC due January 2060 [Member]          
Debt Obligations [Abstract]          
Aggregate debt principal issued   $ 1,000.0      
Interest rate, stated percentage   3.95%      
Debt issued as percent of principal amount   99.36%      
Subsequent Event [Member] | Senior Notes [Member] | EPO Senior Notes Q due January 2020 [Member]          
Debt Obligations [Abstract]          
Repayment of debt obligations   $ 500.0