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Financial Instruments and Risk Management (Foreign Currency Exchange Rate Risk) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk $ (331.4) $ (242.6)
Currency risk | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Impact on pre-tax earnings 14.5 10.0
Total financial instrument exposure to credit risk (144.8) (88.1)
Currency risk | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Impact on pre-tax earnings 5.3 1.3
Total financial instrument exposure to credit risk (48.0) (12.2)
Cash and cash equivalents | Currency risk | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (18.9) (25.0)
Cash and cash equivalents | Currency risk | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (11.8) (12.4)
Equity securities | Currency risk | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (24.0) (13.0)
Equity securities | Currency risk | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk 0.0 0.0
Trade receivables | Currency risk | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (35.9) (14.9)
Trade receivables | Currency risk | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (10.1) (38.6)
Accounts Payable And Accrued Liabilities | Currency risk | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (153.6) (124.1)
Accounts Payable And Accrued Liabilities | Currency risk | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (17.7) (16.4)
Income Taxes Payable | Currency risk | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (3.2) (0.1)
Income Taxes Payable | Currency risk | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (45.6) (40.2)
Other Monetary (Liabilities) Assets | Currency risk | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (66.8) (16.8)
Other Monetary (Liabilities) Assets | Currency risk | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk $ (6.6) $ (6.6)