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Investment in and Advances to Unconsolidated Affiliates Affiliate Balance Sheet (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Investments in and Advances to Affiliates, Affiliate Balance Sheet [Abstract] |  |
Current assets | $ 71.1 | $ 64.5
Property and equipment, net | 231.0 | 234.6
Other assets, net | 241.0 | 236.5
Total assets | 543.1 | 535.6
Current liabilities | 96.8 | 100.3
Long-term debt | 104.6 | 110.1
Other liabilities | 1.2 | 0.1
Members' equity | 340.5 | 325.1
Total liabilities and members' equity | $ 543.1 | $ 535.6

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