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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, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |
Operating revenues | $ 590.0 | $ 827.0 | $ 1,206.0 | $ 1,828.0
Cost of sales | 277.0 | 478.0 | 569.0 | 1,111.0
Operating income | 93.0 | 139.0 | 197.0 | 301.0
Net income | $ 77.0 | $ 120.0 | $ 168.0 | $ 269.0

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