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Investment in and Advances to Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Investments in and Advances to Affiliates [Line Items]          
Other liabilities $ 0.1   $ 0.1   $ 0.1
Distributed earnings from equity investments     $ 14.4 $ 11.7  
Miami Valley Gaming LLC [Member]          
Investments in and Advances to Affiliates [Line Items]          
Equity Method Investment, Ownership Percentage 50.00%   50.00%    
Distributed earnings from equity investments