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Investment in and Advances to Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Jan. 03, 2017
Dec. 31, 2016
Nov. 21, 2016
Aug. 31, 2016
Investments in and Advances to Affiliates [Line Items]              
Other liabilities $ 0.0   $ 0.1        
Distributed earnings from equity investments 4.5 $ 4.3          
Old Bay Gaming and Racing LLC [Member]              
Investments in and Advances to Affiliates [Line Items]              
Equity Method Investment, Ownership Percentage             50.00%
Miami Valley Gaming LLC [Member]              
Investments in and Advances to Affiliates [Line Items]              
Equity Method Investment, Ownership Percentage         50.00%    
Distributed earnings from equity investments $ 4.0 $ 4.0          
Saratoga Casino Black Hawk [Member]              
Investments in and Advances to Affiliates [Line Items]              
Equity Method Investment, Ownership Percentage           25.00%  
Ocean Downs LLC and Racing Services LLC [Member]              
Investments in and Advances to Affiliates [Line Items]              
Equity Method Investment, Effective Ownership Percentage       62.50%