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Investment in Unconsolidated Affiliate and Related Party Transactions Summarized Income Statement of Equity Method Investment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract] |  |  |
Operating revenues | $ 2,803.0 | $ 2,272.0 | $ 2,418.0
Cost of natural gas and NGLs | 1,381.0 | 1,017.0 | 1,097.0
Operating income (loss) | 528.0 | 385.0 | (712.0)
Net income (loss) | $ 400.3 | $ 289.5 | $ (752.0)

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