CONSOLIDATED BALANCE SHEEETS (Parenthetical) - shares	Mar. 31, 2021	Dec. 31, 2020
Public | Common Units
Units outstanding (in shares)	47,837,828	47,821,790
Units issued (in shares)	47,837,828	47,821,790
BP Holdco | Common Units
Units outstanding (in shares)	56,956,712	4,581,177
Units issued (in shares)	56,956,712	4,581,177
BP Holdco | Subordinated Units
Units outstanding (in shares)	0	52,375,535
Units issued (in shares)	0	52,375,535