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Investment in Unconsolidated Affiliates Summarized Income Statement of Equity Method Investment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 748.0	$ 666.0
Cost of natural gas and NGLs	375.0	308.0
Operating income	139.0	140.0
Net income	$ 104.6	$ 110.8

X

- Definition

Equity Method Investment, Summarized Financial Information, Operating Income

+ References

No definition available.

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- Definition

The amount of the cost of sales reported by an equity method investment of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
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-Publisher FASB
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-Section 50
-Paragraph 7
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- Definition

The amount of net income (loss) reported by an equity method investment of the entity.

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-Name Accounting Standards Codification
-Topic 205
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- Definition

The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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