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Investment in Unconsolidated Affiliates Summarized Balance Sheet Information of Equity Method Investment (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Summarized Balance Sheet Information of Equity Method Investment [Abstract] |  |
Current assets | $ 481.0 | $ 416.0
Non-current assets | 11,454.0 | 11,177.0
Current liabilities | 1,403.0 | 1,279.0
Non-current liabilities | $ 2,964.0 | $ 2,660.0

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