Condensed Consolidated Balance Sheets (Parenthetical) - shares	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Preferred units issued (in shares)	2,900,000	4,700,000
Preferred units outstanding (in shares)	2,900,000	4,700,000
Common units issued (in shares)	73,000,000.0	65,500,000
Common units outstanding (in shares)	73,000,000.0	65,500,000