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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total revenues | $ 735.0 | $ 805.0 | $ 1,530.0 | $ 1,553.0
Cost of natural gas and NGLs | 317.0 | 444.0 | 695.0 | 819.0
Operating income | 167.0 | 126.0 | 332.0 | 265.0
Net income | $ 114.8 | $ 86.4 | $ 228.0 | $ 191.0

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