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Equity and Distributions, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2018

Sep. 30, 2017

Sep. 30, 2018

Sep. 30, 2017

Accumulated Other Comprehensive Income (Loss) [Abstract]

Beginning balance

$ (171.7)

$ (280.0)

Other comprehensive income (loss) before reclassifications

(135.8)

(7.5)

Reclassification of losses (gains) to net income

0.2

(19.1)

Total other comprehensive income (loss)

$ (184.1)

$ (177.9)

(135.6)

(26.6)

Ending balance

(307.3)

(306.6)

(307.3)

(306.6)

Interest expense

279.5

243.9

806.2

739.0

Revenue

(9,585.9)

^[1]

(6,886.9)

^[2]

(27,351.9)

^[1]

(20,814.9)

^[2]

Operating costs and expenses

8,001.9

6,079.8

23,776.6

18,143.2

Total

(1,334.6)

(621.3)

(2,933.3)

(2,058.3)

Gains (Losses) on Cash Flow Hedges [Member] | Interest Rate Derivatives [Member]

Accumulated Other Comprehensive Income (Loss) [Abstract]

Beginning balance

(165.1)

(199.8)

Other comprehensive income (loss) before reclassifications

20.7

(4.8)

Reclassification of losses (gains) to net income

29.0

29.9

Total other comprehensive income (loss)

49.7

25.1

Ending balance

(115.4)

(174.7)

(115.4)

(174.7)

Gains (Losses) on Cash Flow Hedges [Member] | Commodity Derivatives [Member]

Accumulated Other Comprehensive Income (Loss) [Abstract]

Beginning balance

(10.1)

(83.8)

Other comprehensive income (loss) before reclassifications

(156.0)

(2.6)

Reclassification of losses (gains) to net income

(28.8)

(49.0)

Total other comprehensive income (loss)

(184.8)

(51.6)

Ending balance

(194.9)

(135.4)

(194.9)

(135.4)

Other [Member]

Accumulated Other Comprehensive Income (Loss) [Abstract]

Beginning balance

3.5

3.6

Other comprehensive income (loss) before reclassifications

(0.5)

(0.1)

Reclassification of losses (gains) to net income

0.0

0.0

Total other comprehensive income (loss)

(0.5)

(0.1)

Ending balance

3.0

3.5

3.0

3.5

Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]

Accumulated Other Comprehensive Income (Loss) [Abstract]

Total

(44.4)

0.2

0.2

(19.1)

Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Gains (Losses) on Cash Flow Hedges [Member] | Interest Rate Derivatives [Member]

Accumulated Other Comprehensive Income (Loss) [Abstract]

Interest expense

9.1

10.3

29.0

29.9

Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Gains (Losses) on Cash Flow Hedges [Member] | Commodity Derivatives [Member]

Accumulated Other Comprehensive Income (Loss) [Abstract]

Revenue

(53.9)

(10.6)

(28.5)

(49.1)

Operating costs and expenses

$ 0.4

$ 0.5

$ (0.3)

$ 0.1

[1]	Revenues are accounted for under ASC 606 upon implementation at January 1, 2018.
[2]	Revenues are accounted for under ASC 605 for historical periods prior to January 1, 2018.

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