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Income Taxes Operating Loss Carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |
State net operating losses usable after limitations from Internal Revenue Code 382 | $ 15.9 |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Gross | 2.5 |
Valuation allowance | 27.2 | $ 15.1
Foreign net operating loss carryforwards | 12.4 | $ 5.9
Investment Tax Credit | 1.0 |
State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Valuation allowance | 2.2 |
Foreign Country [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Valuation allowance | 12.1 |
Foreign operating losses available to carryforward | 70.8 |
Foreign operating losses expiring between 2014 and 2016 | 67.6 |
Foreign operating losses to be carried forward indefinitely | $ 3.2 |

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