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Condensed Consolidated Balance Sheets (Parenthetical) - shares
shares in Millions
Sep. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Preferred units issued (in shares) 9.3 14.0
Preferred units outstanding (in shares) 9.3 14.0
Common units issued (in shares) 60.8 56.1
Common units outstanding (in shares) 60.8 56.1