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Equity and Distributions, Issuances of Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Registration Statements and Equity Offerings [Line Items]          
Distribution reinvestment plan discount rate     0.00%   2.50%
Net Cash Proceeds from Sale of Common Units [Abstract]          
Net cash proceeds from the issuance of common units     $ 82.2 $ 261.0  
Common units issued in connection with employee compensation (in units)   1,626,041      
Common units issued in connection with employee compensation     45.6 $ 39.1  
Common units issued in connection with the vesting of phantom unit awards, net (in units) 120,831 2,379,620      
Treasury Units:          
Amount authorized under 2019 Buyback Program $ 2,000.0   2,000.0    
Remaining available capacity under the 2019 Buyback Program $ 1,920.0   $ 1,920.0    
Total of common units repurchased under a buyback program (in units) 1,056,736 1,852,392 2,909,128    
Common units acquired in connection with buyback program $ 29.5   $ 81.1    
Long-Term Incentive Plan (2008) [Member]          
Net Cash Proceeds from Sale of Common Units [Abstract]          
Common units issued in connection with employee compensation (in units)     1,626,041    
Common units issued in connection with employee compensation     $ 45.6    
Common units issued in connection with the vesting of phantom unit awards, net (in units)     2,500,451    
At-the-Market Registration [Member]          
Registration Statements and Equity Offerings [Line Items]          
Maximum common units authorized for issuance 2,540.0   $ 2,540.0    
Remaining units available for issuance $ 2,540.0   $ 2,540.0    
Distribution Reinvestment Plan [Member]          
Registration Statements and Equity Offerings [Line Items]          
Remaining units available for issuance (in units) 58,798,632   58,798,632    
Net Cash Proceeds from Sale of Common Units [Abstract]          
Number of common units issued (in units)     2,601,727 9,608,839  
Net cash proceeds from the issuance of common units     $ 73.7 $ 253.7  
Distribution Reinvestment Plan [Member] | EPCO and its privately held affiliates [Member]          
Net Cash Proceeds from Sale of Common Units [Abstract]          
Gross proceeds from the sale of common units     $ 14.0    
Employee Unit Purchase Plan [Member]          
Registration Statements and Equity Offerings [Line Items]          
Remaining units available for issuance (in units) 4,919,378   4,919,378    
Net Cash Proceeds from Sale of Common Units [Abstract]          
Number of common units issued (in units)     296,263 268,251  
Net cash proceeds from the issuance of common units     $ 8.5 $ 7.3