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Investment in and Advances to Unconsolidated Affiliates Affiliate Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Investments in and Advances to Affiliates, Affiliate Balance Sheet [Abstract] |  |
Current assets | $ 21.5 | $ 64.5
Property and equipment, net | 98.0 | 234.6
Other assets, net | 107.0 | 236.5
Total assets | 226.5 | 535.6
Current liabilities | 19.3 | 100.3
Long-term debt | 1.6 | 110.1
Other liabilities | 0.1 | 0.1
Members' equity | 205.5 | 325.1
Total liabilities and members' equity | $ 226.5 | $ 535.6

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