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Investment in Unconsolidated Affiliates Summarized Income Statement of Equity Method Investment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total revenues | $ 699.0 | $ 928.0 | $ 2,229.0 | $ 2,481.0
Cost of natural gas and NGLs | 263.0 | 516.0 | 958.0 | 1,335.0
Operating income | 175.0 | 171.0 | 507.0 | 436.0
Net income | $ 123.0 | $ 129.0 | $ 351.0 | $ 320.0

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