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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity in earnings of unconsolidated affiliates | $ 40.1 | $ 33.6 | $ 103.3 | $ 98.6
Total revenues | 928.0 | 705.0 | 2,481.0 | 1,997.0
Cost of natural gas and NGLs | 516.0 | 349.0 | 1,335.0 | 936.0
Operating income | 171.0 | 137.0 | 436.0 | 399.0
Net income | $ 129.0 | $ 104.0 | $ 320.0 | $ 301.0

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