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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details)
$ in Millions
3 Months Ended
Jan. 01, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Notes Receivable, Related Parties         $ 75.0
Document Period End Date   Mar. 31, 2020      
Loss Contingency Accrual, at Carrying Value   $ 116.0   $ 120.0  
Loss Contingency, Estimate of Possible Loss   80.0      
Accrual for Environmental Loss Contingencies   $ 313.0   $ 320.0  
Sunoco, Inc. [Member]          
Loss Contingency, Pending Claims, Number   5      
Payments for Environmental Liabilities     $ 6.0    
Revolution Pipeline [Member]          
Payments for Legal Settlements $ 2.0        
SPLP [Member]          
Proposed Environmental Penalty   $ 5.4      
SPLP and Mid-Valley Pipeline [Member]          
Proposed Environmental Penalty   $ 1.0      
Sunoco [Member]          
Site Contingency, Number of Sites Needing Remediation   29      
PES [Member]          
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest   7.40%      
Civil Penalties [Member] | Revolution Pipeline [Member]          
Payments for Legal Settlements $ 28.6