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Subsequent Event (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Feb. 28, 2021
Aug. 31, 2020
Jan. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Aug. 02, 2020
Debt Obligations [Abstract]            
Borrowings under debt agreements       $ 5,411.8 $ 40,318.1  
Repayment of debt obligations       3,406.6 $ 39,617.3  
Senior Debt Obligations [Member]            
Debt Obligations [Abstract]            
Aggregate debt principal issued       3,000.0    
Senior Debt Obligations [Member] | EPO Senior Notes AAA, due January 2030 [Member]            
Debt Obligations [Abstract]            
Aggregate debt principal issued     $ 1,000.0 $ 1,000.0    
Interest rate, stated percentage       2.80%    
Debt issued as percent of principal amount       99.921%    
Senior Debt Obligations [Member] | EPO Senior Notes TT, due February 2021 [Member]            
Debt Obligations [Abstract]            
Interest rate, stated percentage       2.80%    
Forecast [Member] | EPO Senior Notes TT, due February 2021 [Member]            
Debt Obligations [Abstract]            
Repayment of debt obligations $ 750.0          
Subsequent Event [Member] | Senior Notes [Member]            
Debt Obligations [Abstract]            
Aggregate debt principal issued   $ 1,250.0        
Borrowings under debt agreements   1,250.0        
Subsequent Event [Member] | Senior Debt Obligations [Member]            
Debt Obligations [Abstract]            
Aggregate debt principal issued   1,250.0        
Subsequent Event [Member] | Senior Debt Obligations [Member] | EPO Senior Notes AAA, due January 2030 [Member]            
Debt Obligations [Abstract]            
Aggregate debt principal issued   $ 250.0        
Interest rate, stated percentage           2.80%
Debt issued as percent of principal amount   107.211%        
Subsequent Event [Member] | Senior Debt Obligations [Member] | EPO Senior Notes DDD, due February 2052 [Member]            
Debt Obligations [Abstract]            
Aggregate debt principal issued   $ 1,000.0        
Interest rate, stated percentage           3.20%
Debt issued as percent of principal amount   99.233%