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Summary of Significant Accounting Policies (Gaming Taxes) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accounting Policies [Abstract]        
Gaming taxes $ 81.5 $ 85.5 $ 164.1 $ 168.9