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Income Taxes Income Tax Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Entity Location [Line Items] |  |  |  |
Income tax benefit as a result of the Tax Act |  | $ (27.3) |  |
UNITED STATES |  |  |  |
Entity Location [Line Items] |  |  |  |
Effective tax rate | 35.00% |  | 26.80% | 35.00%
MEXICO |  |  |  |
Entity Location [Line Items] |  |  |  |
Effective tax rate |  |  | 30.00% |
GUATEMALA |  |  |  |
Entity Location [Line Items] |  |  |  |
Effective tax rate |  |  | 25.00% |
EL SALVADOR |  |  |  |
Entity Location [Line Items] |  |  |  |
Effective tax rate |  |  | 30.00% |
COLOMBIA |  |  |  |
Entity Location [Line Items] |  |  |  |
Effective tax rate |  |  | 37.00% |

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