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Financial Instruments - Summary of Interest Risk Factor (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of interest risk factor [line items]          
Loans and financing $ 3,647.6 $ 4,198.5 $ 3,759.9 $ 3,759.9 $ 4,229.9
Interbank deposit certificate CDI rate [member]          
Disclosure of interest risk factor [line items]          
Cash equivalents and financial investments 403.1        
Net impact $ 403.1        
Rates considered 6.40%        
Libor [member]          
Disclosure of interest risk factor [line items]          
Cash equivalents and financial investments $ 62.3        
Loans and financing (68.0)        
Net impact $ (5.7)        
Rates considered 2.87%        
TJLP [member]          
Disclosure of interest risk factor [line items]          
Loans and financing $ (1.9)        
Net impact $ (1.9)        
Rates considered 6.56%        
-50% [member] | Interbank deposit certificate CDI rate [member]          
Disclosure of interest risk factor [line items]          
Cash equivalents and financial investments $ (12.6)        
Net impact $ (12.6)        
Rates considered 3.28%        
-50% [member] | Libor [member]          
Disclosure of interest risk factor [line items]          
Cash equivalents and financial investments $ (0.9)        
Loans and financing 1.0        
Net impact $ 0.1        
Rates considered 1.43%        
-50% [member] | TJLP [member]          
Disclosure of interest risk factor [line items]          
Loans and financing $ 0.1        
Net impact $ 0.1        
Rates considered 3.49%        
-25% [member] | Interbank deposit certificate CDI rate [member]          
Disclosure of interest risk factor [line items]          
Cash equivalents and financial investments $ (6.0)        
Net impact $ (6.0)        
Rates considered 4.91%        
-25% [member] | Libor [member]          
Disclosure of interest risk factor [line items]          
Cash equivalents and financial investments $ (0.5)        
Loans and financing $ 0.5        
Rates considered 2.14%        
-25% [member] | TJLP [member]          
Disclosure of interest risk factor [line items]          
Rates considered 5.24%        
Probable scenario [member] | Interbank deposit certificate CDI rate [member]          
Disclosure of interest risk factor [line items]          
Cash equivalents and financial investments $ 0.6        
Net impact $ 0.6        
Rates considered 6.55%        
Probable scenario [member] | Libor [member]          
Disclosure of interest risk factor [line items]          
Rates considered 2.86%        
Probable scenario [member] | TJLP [member]          
Disclosure of interest risk factor [line items]          
Rates considered 6.98%        
+25% [member] | Interbank deposit certificate CDI rate [member]          
Disclosure of interest risk factor [line items]          
Cash equivalents and financial investments $ 7.2        
Net impact $ 7.2        
Rates considered 8.19%        
+25% [member] | Libor [member]          
Disclosure of interest risk factor [line items]          
Cash equivalents and financial investments $ 0.4        
Loans and financing (0.5)        
Net impact $ (0.1)        
Rates considered 3.57%        
+25% [member] | TJLP [member]          
Disclosure of interest risk factor [line items]          
Rates considered 8.73%        
+50% [member] | Interbank deposit certificate CDI rate [member]          
Disclosure of interest risk factor [line items]          
Cash equivalents and financial investments $ 13.8        
Net impact $ 13.8        
Rates considered 9.83%        
+50% [member] | Libor [member]          
Disclosure of interest risk factor [line items]          
Cash equivalents and financial investments $ 0.9        
Loans and financing (1.0)        
Net impact $ (0.1)        
Rates considered 4.29%        
+50% [member] | TJLP [member]          
Disclosure of interest risk factor [line items]          
Loans and financing $ (0.1)        
Net impact $ (0.1)        
Rates considered 10.47%