CONSOLIDATED BALANCE SHEEETS (Parenthetical) - shares	Jun. 30, 2020	Dec. 31, 2019
Public | Common Units
Units outstanding (in shares)	47,821,790	47,806,563
Units issued (in shares)	47,821,790	47,806,563
BP Holdco | Common Units
Units outstanding (in shares)	4,581,177	4,581,177
Units issued (in shares)	4,581,177	4,581,177
BP Holdco | Subordinated Units
Units outstanding (in shares)	52,375,535	52,375,535
Units issued (in shares)	52,375,535	52,375,535