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Income Taxes - Reconciliation of Income Tax Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of income tax reconciliation [abstract]      
Profit (loss) before taxation $ (136.2) $ 307.9 $ 180.6
Income tax and social contribution expense at the nominal Brazilian enacted tax rate - 34% 46.3 (104.7) (61.4)
Tax on profits of overseas subsidiaries (33.2) (9.8) (4.0)
Functional currency effect of the non monetary assets (117.4) (5.0) 206.1
Research and development tax incentives 27.7 43.8 36.5
Interest on own capital 3.0 16.9 6.1
Fiscal credits (recognized and non recognized) (26.0) 19.3 (30.4)
Tax rate diference 30.9 5.3 (0.7)
Other difference between IFRS and fiscal basis 41.4 3.3 (90.9)
Other (7.7) 3.0 (61.6)
Total income tax expense (81.3) 76.8 61.1
Income tax and social contribution income (expense) benefit as reported (35.0) (27.9) (0.3)
Current income tax and social contribution (expense) benefit as reported (56.2) (40.8) (137.8)
Deferred income tax and social contribution income (expense) benefit as reported $ 21.2 $ 12.9 $ 137.5