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Income Taxes - Additional disclosure and 2017 Tax Act (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Income Taxes |
Additional income tax benefit from effect of Tax Cuts and Jobs Act of 2017 | $ 1.7
2017 Tax Act, Amount of increase in gross deferred tax assets | 6.8
2017 Tax Act, Increase in deferred tax assets valuation allowance | $ 6.8

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