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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Mar. 29, 2018
Decrease (increase) in:            
Accounts receivable - trade     $ (124.8) $ 18.6    
Accounts receivable - related parties     (10.6) (0.2)    
Inventories     (56.4) 17.6    
Prepaid and other current assets     (291.2) (82.4)    
Other assets     (12.4) (11.9)    
Increase (decrease) in:            
Accounts payable - trade     60.0 112.1    
Accounts payable - related parties     (21.0) (3.1)    
Accrued product payables     107.6 30.7    
Accrued interest     (3.3) 14.0    
Other current liabilities     83.0 (306.4)    
Other liabilities     (62.9) (17.5)    
Net effect of changes in operating accounts     (332.0) (228.5)    
Liability for construction in progress expenditures     426.8   $ 567.6  
Business Combination            
Cash used for business combinations, net of cash received     0.0 149.7    
Gain on step acquisition of Delaware Processing $ 0.0 $ 2.4 $ 0.0 39.4    
Delaware Basin Gas Processing LLC [Member]            
Business Combination            
Remaining membership interest acquired           50.00%
Cash used for business combinations, net of cash received       150.0    
Gain on step acquisition of Delaware Processing       $ 39.4