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Financial Instruments - Exposure to Currency Risk (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and investments $ 862.8 $ 399.6 $ 107.0
Deferred tax assets and   liabilities (477.2) (461.2)  
Gains (losses) on change in value of foreign currency basis spreads, net of tax (25.4) 7.7  
Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and investments 69.0 68.4  
Other current and non-current assets 113.4 83.3  
Income taxes receivable (payable), current and non- current (73.8) 28.3  
Accounts payable and accrued liabilities and non- current liabilities (342.4) (408.8)  
Deferred tax assets and   liabilities (475.5) (461.2)  
Canadian dollar      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) on change in value of foreign currency basis spreads, net of tax (5.5) 4.1  
Canadian dollar | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and investments 40.3 47.6  
Other current and non-current assets 6.5 4.6  
Income taxes receivable (payable), current and non- current (7.2) 8.0  
Accounts payable and accrued liabilities and non- current liabilities (67.2) (56.1)  
Deferred tax assets and   liabilities (8.6) 12.0  
Mexican peso      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) on change in value of foreign currency basis spreads, net of tax (2.7) 2.5  
Mexican peso | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and investments 7.9 3.2  
Other current and non-current assets 19.9 14.3  
Income taxes receivable (payable), current and non- current 12.8 11.4  
Accounts payable and accrued liabilities and non- current liabilities (28.4) (54.0)  
Deferred tax assets and   liabilities 12.7 33.9  
Argentine peso | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and investments 0.1 0.4  
Other current and non-current assets 43.6 21.5  
Income taxes receivable (payable), current and non- current 0.6 0.0  
Accounts payable and accrued liabilities and non- current liabilities (73.7) (79.0)  
Deferred tax assets and   liabilities (10.4) (12.1)  
Bolivian boliviano | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and investments 10.0 9.2  
Other current and non-current assets 8.7 8.0  
Income taxes receivable (payable), current and non- current (18.0) (7.0)  
Accounts payable and accrued liabilities and non- current liabilities (7.0) (7.6)  
Deferred tax assets and   liabilities (0.2) (3.8)  
European euro | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and investments 0.0 0.1  
Other current and non-current assets 0.0 0.0  
Income taxes receivable (payable), current and non- current 0.0 (2.2)  
Accounts payable and accrued liabilities and non- current liabilities (0.1) (0.1)  
Deferred tax assets and   liabilities 0.0 0.0  
Peruvian sol      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) on change in value of foreign currency basis spreads, net of tax 0.2 2.9  
Peruvian sol | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and investments 2.9 6.1  
Other current and non-current assets 25.2 22.0  
Income taxes receivable (payable), current and non- current (31.6) 5.1  
Accounts payable and accrued liabilities and non- current liabilities (39.8) (87.2)  
Deferred tax assets and   liabilities (55.3) (68.1)  
Guatemala quetzal | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and investments 0.1 0.2  
Other current and non-current assets 0.1 0.1  
Income taxes receivable (payable), current and non- current 0.0 (0.1)  
Accounts payable and accrued liabilities and non- current liabilities (6.2) (9.6)  
Deferred tax assets and   liabilities 0.0 0.0  
Chilean peso      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) on change in value of foreign currency basis spreads, net of tax (6.4) (3.0)  
Chilean peso | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and investments 6.6 1.2  
Other current and non-current assets 5.5 7.2  
Income taxes receivable (payable), current and non- current (15.9) 18.5  
Accounts payable and accrued liabilities and non- current liabilities (77.1) (75.9)  
Deferred tax assets and   liabilities (61.3) (89.8)  
Brazilian real      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) on change in value of foreign currency basis spreads, net of tax (11.0) 1.2  
Brazilian real | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and investments 1.1 0.4  
Other current and non-current assets 3.9 5.6  
Income taxes receivable (payable), current and non- current (14.5) (5.4)  
Accounts payable and accrued liabilities and non- current liabilities (42.9) (39.3)  
Deferred tax assets and   liabilities $ (352.4) $ (333.3)