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Investment in Unconsolidated Affiliate and Related Party Transactions Summarized Income Statement of Equity Method Investment (Details) (USD $) In Millions, unless otherwise specified | 8 Months Ended
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Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract] |
Operating revenues | $ 2,122.6
Cost of sales | 1,240.5
Operating income | 321.9
Net income | $ 288.6

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