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Provisions and Contingent Liabilities - Summary of Labor, Tax and Civil Provisions (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Jan. 01, 2016
Disclosure of provisions [line items]          
Provisions $ 242.4 $ 260.3   $ 302.8  
Current portion 116.9 124.1 $ 123.8 123.9 $ 89.7
Non-current portion 125.5 136.2 $ 179.0 179.0  
Tax related provision on IRPJ [member]          
Disclosure of provisions [line items]          
Provisions 9.2 10.1      
Tax related provision on PIS and COFINS [member]          
Disclosure of provisions [line items]          
Provisions 5.3 6.8      
Tax related provision on Social security contributions [member]          
Disclosure of provisions [line items]          
Provisions 2.4 2.8      
Tax related provision on Import taxes [member]          
Disclosure of provisions [line items]          
Provisions 0.8 0.9      
Tax related provision on FUNDAF [member]          
Disclosure of provisions [line items]          
Provisions 0.1        
Others tax related provisions [member]          
Disclosure of provisions [line items]          
Provisions 0.2 0.4      
Tax related provision [member]          
Disclosure of provisions [line items]          
Provisions 18.0 21.0      
Labor related provision on Plurimas [member]          
Disclosure of provisions [line items]          
Provisions 10.0 11.3      
Labor related provision on reintegration [member]          
Disclosure of provisions [line items]          
Provisions 7.0 5.1      
Overtime provision [member]          
Disclosure of provisions [line items]          
Provisions 6.0 1.7      
Dangerousness related provision [member]          
Disclosure of provisions [line items]          
Provisions 1.0 0.1      
Labor related provision on indemnity [member]          
Disclosure of provisions [line items]          
Provisions 3.1 2.3      
Labor related provision on third parties [member]          
Disclosure of provisions [line items]          
Provisions 0.5 0.9      
Other labor related provision [member]          
Disclosure of provisions [line items]          
Provisions 12.4 11.6      
Labor related provision [member]          
Disclosure of provisions [line items]          
Provisions 40.0 33.0      
Civil related provision on Indemnity claims [member]          
Disclosure of provisions [line items]          
Provisions 0.4 0.2      
Civil related provision [member]          
Disclosure of provisions [line items]          
Provisions 0.4 0.2      
Provisions labor, taxes and civil [member]          
Disclosure of provisions [line items]          
Provisions 58.4 54.2   $ 93.1  
Current portion 20.7 21.5      
Non-current portion $ 37.7 $ 32.7