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Summary of Significant Accounting Policies (Gaming Taxes) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Accounting Policies [Abstract] |  |
Gaming taxes | $ 78.1 | $ 83.2

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- References No definition available. + Details
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- Definition Amount of tax expense classified as other. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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