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Derivative Financial Instruments - Summary of Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instrument assets and liability $ 1.4 $ 25.4
Equity investments [member] | Interest rate risk [member] | Santander [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instrument assets and liability   (0.1)
Equity investments [member] | Interest rate risk [member] | BNP Paribas [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instrument assets and liability   (0.1)
Equity investments [member] | Interest rate risk [member] | Bradesco [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instrument assets and liability   (1.1)
Other derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instrument assets and liability $ 0.2 0.6
Real expenses [member] | Currency swap contract [member] | Currency risk [member] | Citibank [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2019  
Derivative financial instrument assets and liability $ (1.9) 0.8
Real expenses [member] | Currency swap contract [member] | Currency risk [member] | BofaMLynch [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instrument assets and liability   0.3
Real expenses [member] | Currency swap contract [member] | Currency risk [member] | Santander [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2019  
Derivative financial instrument assets and liability $ (1.2) 1.4
Real expenses [member] | Currency swap contract [member] | Currency risk [member] | BNP Paribas [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2019  
Derivative financial instrument assets and liability $ (1.2) 1.3
Real expenses [member] | Currency swap contract [member] | Currency risk [member] | Bradesco [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2019  
Derivative financial instrument assets and liability $ (1.9)  
Real expenses [member] | Currency swap contract [member] | Currency risk [member] | ItauBBA [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2019  
Derivative financial instrument assets and liability $ (1.3)  
Export financing [member] | Interest swap [member] | Interest rate risk [member] | BofaMLynch [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instrument assets and liability   4.5
Export financing [member] | Interest swap [member] | Interest rate risk [member] | Santander [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2019  
Derivative financial instrument assets and liability $ 0.9 5.0
Export financing [member] | Interest swap [member] | Interest rate risk [member] | Bradesco [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instrument assets and liability   3.7
Export financing [member] | Swap contract [member] | Exchange and currency risk rate [member] | Santander [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instrument assets and liability   (0.1)
Export financing [member] | Swap contract [member] | Exchange and currency risk rate [member] | ItauBBA [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2027  
Derivative financial instrument assets and liability $ 2.3 0.5
Export financing [member] | Swap contract [member] | Other derivatives [member] | Currency risk [member] | BNP Paribas [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instrument assets and liability   0.1
Export financing [member] | Swap contract [member] | Other derivatives [member] | Currency risk [member] | Natixis [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instrument assets and liability   (0.3)
Export financing [member] | Swap contract [member] | Other derivatives [member] | Currency risk [member] | Santander Totta [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2019  
Project development expense [member] | Interest swap [member] | Interest rate risk [member] | BofaMLynch [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2022  
Derivative financial instrument assets and liability $ 0.5 0.7
Project development expense [member] | Interest swap [member] | Interest rate risk [member] | Santander [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2022  
Derivative financial instrument assets and liability $ 1.7 2.7
Project development expense [member] | Interest swap [member] | Interest rate risk [member] | Bradesco [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2022  
Derivative financial instrument assets and liability $ 0.4 0.7
Project development expense [member] | Interest swap [member] | Interest rate risk [member] | Votorantim [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2022  
Derivative financial instrument assets and liability $ 0.3 0.5
Project development expense [member] | Interest swap [member] | Interest rate risk [member] | ItauBBA [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2023  
Derivative financial instrument assets and liability $ 0.3 0.3
Project development expense [member] | Interest swap [member] | Interest rate risk [member] | HSBC [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2022  
Derivative financial instrument assets and liability $ 0.3 0.4
Project development expense [member] | Interest swap [member] | Interest rate risk [member] | Societe Generale [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2022  
Derivative financial instrument assets and liability $ 0.2 0.2
Project development expense [member] | Interest swap [member] | Interest rate risk [member] | Safra [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2022  
Derivative financial instrument assets and liability $ 0.1 0.2
Project development expense [member] | Interest swap [member] | Interest rate risk [member] | Morgan Stanley S And A [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2022  
Derivative financial instrument assets and liability $ 1.7 3.0
Recourse and non recourse debt [member] | Other derivatives [member] | Zero cost collar [member] | Interest rate risk [member] | Natixis [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2022  
Derivative financial instrument assets and liability $ 0.3 1.0
Acquisition of property plant and equipment [member] | Interest swap [member] | Other derivatives [member] | Interest rate risk [member] | Compass bank [member]    
Disclosure of detailed information about financial instruments [line items]    
Settlement date 2024  
Derivative financial instrument assets and liability $ (0.1) (0.2)
Hedged item [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instrument assets and liability $ 1.2 $ 24.8