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Financial Investments - Summary of Financial Investments (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Private securities [member]    
Disclosure of financial assets [line items]    
Borrowings, maturity More than 90 days  
Structured notes [member]    
Disclosure of financial assets [line items]    
Guarantee deposits $ 83.2 $ 222.2
Investment of Guarantee deposits $ 123.4  
Structured notes maturity period 15-year  
Fixed deposits [member]    
Disclosure of financial assets [line items]    
Borrowings, maturity higher than 90 days  
Financial institution and Brazilian Government [member] | Structured notes [member]    
Disclosure of financial assets [line items]    
Credit risk $ 1,103.7 $ 855.1