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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

X

- Definition

The number of limited partner units issued.

+ References

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-Topic 505
-SubTopic 10
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- Definition

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