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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - shares shares in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Common units issued | 54.3 | 54.2
Common units outstanding | 54.3 | 54.2
Preferred units issued | 14.0 | 14.0
Preferred units outstanding | 14.0 | 14.0

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