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Investment in Unconsolidated Affiliates Summarized Income Statement of Equity Method Investment (Details) - USD ($) $ in Millions | 3 Months Ended
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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

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