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Legal Proceedings (Details) R$ in Millions, $ in Millions | Feb. 25, 2015 USD ($) | Feb. 25, 2015 BRL (R$) | Jan. 13, 2015 USD ($) | Jan. 13, 2015 BRL (R$) | Dec. 31, 2017 USD ($)
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Income Tax Examination [Line Items] |  |  |  |  |
Assessments sought again entity | R$ |  | R$ 33.3 |  | R$ 14.4 |
Accrued estimated losses |  |  |  |  | $ 1.8
Pending Litigation [Member] | Brazilian Federal Tax Authorities [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Assessments sought again entity | $ 10.1 |  | $ 4.3 |  |

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