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Summary of Significant Accounting Policies (Gaming Taxes) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accounting Policies [Abstract]        
Gaming taxes $ 83.1 $ 81.5 $ 241.5 $ 248.5