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Subsequent Events (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Terminal
shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
May 15, 2020
$ / shares
Feb. 14, 2020
$ / shares
Nov. 14, 2019
$ / shares
Aug. 14, 2019
$ / shares
May 15, 2019
$ / shares
Feb. 14, 2019
$ / shares
Nov. 14, 2018
$ / shares
Aug. 14, 2018
$ / shares
May 15, 2018
$ / shares
Feb. 14, 2018
$ / shares
Nov. 14, 2017
$ / shares
Aug. 14, 2017
$ / shares
May 15, 2017
$ / shares
Feb. 14, 2017
$ / shares
Subsequent Event [Line Items]                                    
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest (in dollars per share) | $ / shares   $ 4.0350 $ 3.7925 $ 3.5225     $ 1.0200 $ 1.0125 $ 1.0050 $ 0.9975 $ 0.9775 $ 0.9575 $ 0.9375 $ 0.9200 $ 0.9050 $ 0.8900 $ 0.8725 $ 0.8550
Proceeds from Sale of Other Assets   $ 65,366 $ 576,568 $ 44,392                            
Gain (Loss) on Disposition of Other Assets   $ 28,966 $ 353,797 $ 18,505                            
Subsequent Event [Member]                                    
Subsequent Event [Line Items]                                    
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest (in dollars per share) | $ / shares           $ 1.0275                        
Stock Repurchase Program, Authorized Amount $ 750,000                                  
Stock Repurchased During Period, Shares | shares 3,600                                  
Payments for Repurchase of Common Stock $ 202,000                                  
Forecast [Member]                                    
Subsequent Event [Line Items]                                    
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest (in dollars per share) | $ / shares         $ 1.0275                          
Buckeye Partners, L.P. [Member] | Subsequent Event [Member]                                    
Subsequent Event [Line Items]                                    
Number Of Marine Terminals Sold | Terminal 3                                  
Proceeds from Sale of Other Assets $ 252,600                                  
Asset Impairment Charges 5,400                                  
Saddlehorn Pipeline Company [Member]                                    
Subsequent Event [Line Items]                                    
Equity Method Investment, Ownership Percentage   40.00%                                
Saddlehorn Pipeline Company [Member] | Subsequent Event [Member]                                    
Subsequent Event [Line Items]                                    
Proceeds from Sale of Other Assets $ 79,900                                  
Equity Method Investment Sold Percentage 10.00%                                  
Equity Method Investment, Ownership Percentage 30.00%                                  
Gain (Loss) on Disposition of Other Assets $ 12,900