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Investment in Unconsolidated Affiliates Summarized Income Statement of Equity Method Investment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |
Operating revenues | $ 529.0 | $ 590.0 | $ 1,038.0 | $ 1,206.0
Cost of natural gas and natural gas liquids | 254.0 | 277.0 | 449.0 | 569.0
Operating income | 57.0 | 93.0 | 160.0 | 197.0
Net income | $ 35.0 | $ 77.0 | $ 121.0 | $ 168.0

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