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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, 2017 | Mar. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |
Operating revenues | $ 666.0 | $ 509.0
Cost of natural gas and natural gas liquids | 308.0 | 195.0
Operating income | 140.0 | 103.0
Net income | $ 110.8 | $ 86.0

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