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Condensed Consolidated Balance Sheets (Parenthetical) - shares shares in Millions | Sep. 30, 2019 | Dec. 31, 2018
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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

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