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Summary of Significant Accounting Policies (Gaming Taxes) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accounting Policies [Abstract]        
Gaming taxes $ 80.3 $ 83.8 $ 158.4 $ 167.0