The increase in noncontrolling interest due to contributions.

No definition available.

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Amount of decrease in partners capital from sale of a portion of the parent's controlling interest.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest.

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Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Total contributions made by each class of partners (i.e., general, limited and preferred partners).

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Total distributions to each class of partners (i.e., general, limited and preferred partners).

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Total change in each class of partners' capital accounts during the year due to exchanges and conversions. Partners include general, limited and preferred partners.

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Total change in each class of partners' capital accounts during the year due to redemptions and adjustments to redemption value. All partners include general, limited and preferred partners.

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Amount of partners' capital (deficit), including portions attributable to both the parent and noncontrolling interests. Excludes temporary equity and is sometimes called permanent equity.

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Amount of increase (decrease) in partners' capital classified as other.

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No definition available.

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The amount of accretion of the preferred stock redemption discount during the period.

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No definition available.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($) $ in Millions	Total	Noncontrolling Interests [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	General Partner [Member]	Class F Units [Member]	Series 1 Preferred units [Member]	Class D Unit [Member]	Class E Unit [Member]	Class A Common Units [Member]	Class B Common Unit [Member]	I Units [Member]	Incentive Distribution Unit [Member]
Beginning balance at Dec. 31, 2015		$ 3,944.5	$ (370.0)	$ 147.4		$ 1,186.8	$ 2,517.6	$ 778.2			$ 212.6	$ 495.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of preferred units (Note 11)						0.0
Net income	$ (242.7)			(665.4)	$ 0.0	67.5	115.6	31.7	$ 458.6	$ 13.7	(212.6)	15.7
Distribution payable		(125.2)		(12.9)	0.0	(67.5)	(115.6)	(31.7)	(458.6)	(13.7)		(15.6)
Accretion of discount on preferred units	3.5					3.5
Waiver of Class D units (Note 11)				0.0			0.0					0.0
Issuance of Class A units (Note 11)				0.0	0.0				0.0
Sale of noncontrolling interest in subsidiary		0.0		0.0					0.0	0.0	0.0
Other									0.0
Contributions				0.0
Sale of Midcoast assets (Note 6)				0.0
Changes in fair value of derivative financial instruments reclassified to earnings			29.7
Changes in fair value of derivative financial instruments recognized in other comprehensive loss	(134.3)		(134.3)
Capital contributions		79.2
Acquisition of noncontrolling interest in subsidiary		0.0
Sale of Midcoast assets (Note 6)		0.0
Net income	52.8	(52.8)
Ending balance at Sep. 30, 2016	7,821.4	3,845.7	(474.6)	(530.9)	0.0	1,190.3	2,517.6	778.2	0.0	0.0	0.0	495.1
Beginning balance at Dec. 31, 2016	7,822.5	3,846.1	(339.3)	(666.8)		1,191.5	2,517.6	778.2			0.0	495.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of preferred units (Note 11)						(1,200.0)
Net income	251.2			79.8	11.1	29.0	0.0	19.0	141.1	9.1	(8.9)	0.0
Distribution payable		(376.0)		(9.5)	(7.4)	(29.0)	(38.5)	(23.2)	(381.4)	(10.0)		(5.3)
Accretion of discount on preferred units	8.5					8.5
Waiver of Class D units (Note 11)				2,969.0			(2,479.1)					(489.9)
Issuance of Class A units (Note 11)				(263.0)	263.0				1,200.0
Sale of noncontrolling interest in subsidiary		411.0		0.8					28.5	0.9	8.9
Other									0.7
Contributions				92.1
Sale of Midcoast assets (Note 6)				(2,126.5)
Changes in fair value of derivative financial instruments reclassified to earnings			30.5
Changes in fair value of derivative financial instruments recognized in other comprehensive loss	(24.5)		(24.5)
Capital contributions		1,410.4
Acquisition of noncontrolling interest in subsidiary		(360.3)
Sale of Midcoast assets (Note 6)		(296.6)
Net income	(261.8)	261.8
Ending balance at Sep. 30, 2017	$ 6,668.6	$ 4,896.4	$ (333.3)	$ 75.9	$ 266.7	$ 0.0	$ 0.0	$ 774.0	$ 988.9	$ 0.0	$ 0.0	$ 0.0