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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

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- Definition Amount of tax expense classified as other. + References No definition available. + Details
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