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Income Taxes - Tax Reform (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Income Tax Disclosure [Abstract] |
Income tax benefit | $ 9.9
Provisional impact related to remeasuring deferred taxes | 31.0
Offsetting tax benefit of remeasured valuation allowance | 31.0
Provisional reduction to NOLs | $ 102.6

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