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Income Taxes Tax Reform (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Foreign Earnings Repatriated | $ 24.0 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% | 35.00% | 35.00%
Income Tax Expense (Benefit) | $ 1.1 |  |
RepatriationTollCharge | $ 2.0 |  |

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