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Investment in Unconsolidated Affiliate and Related Party Transactions Summarized Balance Sheet Information of Equity Method Investment (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Summarized Financial Information of Equity Method Investment [Line Items] |  |
Current assets | $ 416.0 | $ 396.0
Non-current assets | 11,177.0 | 10,816.0
Current liabilities | 1,279.0 | 362.0
Non-current liabilities | $ 2,660.0 | $ 3,056.0

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