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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |
Operating revenues | $ 646.0 | $ 803.0 | $ 1,852.0 | $ 2,632.0
Cost of sales | 287.0 | 439.0 | 856.0 | 1,550.0
Operating income | (975.0) | 152.0 | (778.0) | 452.0
Net income | $ (985.0) | $ 139.0 | $ (817.0) | $ 408.0

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