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Description of Business and Significant Accounting Policies - Recent Accounting Pronouncements (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Accounting Policies [Abstract] |
Share-based compensation, excess tax benefit | $ 5.7

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- Definition Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount + References No definition available. + Details
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- References No definition available. + Details
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