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Subsequent Event (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 30, 2018
Feb. 15, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Obligations [Abstract]          
Repayment of debt obligations     $ 68,459.6 $ 61,672.6 $ 19,867.2
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes B [Member]          
Debt Obligations [Abstract]          
Maturity date     Jan. 15, 2068    
Interest rate terms     fixed/variable    
Interest rate, stated percentage [1]     7.034%    
Variable annual interest rate thereafter, variable rate basis [2]     3-month LIBOR    
Variable interest rate [2]     2.68%    
Forecast [Member] | Junior Debt Obligations [Member]          
Debt Obligations [Abstract]          
Estimated annual interest expense savings $ 11.3        
Forecast [Member] | Junior Debt Obligations [Member] | EPO Junior Subordinated Notes B [Member]          
Debt Obligations [Abstract]          
Repayment of debt obligations $ 682.7        
Subsequent Event [Member]          
Debt Obligations [Abstract]          
Aggregate debt principal issued   $ 2,700.0      
Subsequent Event [Member] | Senior Debt Obligations [Member]          
Debt Obligations [Abstract]          
Aggregate debt principal issued   2,000.0      
Subsequent Event [Member] | Senior Debt Obligations [Member] | EPO Senior Notes TT [Member]          
Debt Obligations [Abstract]          
Aggregate debt principal issued   $ 750.0      
Maturity date   Feb. 15, 2021      
Interest rate terms   fixed      
Interest rate, stated percentage   2.80%      
Debt issued as percent of principal amount   99.946%      
Subsequent Event [Member] | Senior Debt Obligations [Member] | EPO Senior Notes UU [Member]          
Debt Obligations [Abstract]          
Aggregate debt principal issued   $ 1,250.0      
Maturity date   Feb. 15, 2048      
Interest rate terms   fixed      
Interest rate, stated percentage   4.25%      
Debt issued as percent of principal amount   99.865%      
Subsequent Event [Member] | Junior Debt Obligations [Member]          
Debt Obligations [Abstract]          
Aggregate debt principal issued   $ 700.0      
Subsequent Event [Member] | Junior Debt Obligations [Member] | EPO Junior Subordinated Notes F [Member]          
Debt Obligations [Abstract]          
Aggregate debt principal issued   $ 700.0      
Maturity date   Feb. 15, 2078      
Interest rate terms   fixed/variable      
Interest rate, stated percentage   5.375%      
Variable annual interest rate thereafter, variable rate basis   3-month LIBOR      
Variable interest rate   2.57%      
Debt issued as percent of principal amount   100.00%      
[1] Interest was payable semi-annually in arrears in January and July of each year, which commenced in January 2008.
[2] Interest was payable quarterly in arrears in January, April, July and October of each year commencing in April 2018.