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Risk Management Activities - Schedule of Combined Maximum Credit Risk Exposure (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Trade and other receivables    
Disclosure of credit risk exposure [line items]    
VAT, import duties, prepayments, payroll receivables, derivative contracts and diesel rebates $ 126.2 $ 181.4
Environmental trust funds | Credit risk    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 98.8 88.1
Trade and other receivables | Credit risk    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 71.8 82.3
Loan advanced – contractor | Credit risk    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 23.4 27.3
Derivative financial assets | Credit risk    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 0.0 5.1
Cash and cash equivalents | Credit risk    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk $ 769.4 $ 524.7