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Financial Instruments and Risk Management (Foreign Currency Exchange Rate Risk) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk $ 242.6 $ 153.5
Currency risk | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Impact on pre-tax earnings 10.0 3.6
Total financial instrument exposure to credit risk 88.1 36.1
Currency risk | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Impact on pre-tax earnings 1.3 0.3
Total financial instrument exposure to credit risk 12.2 4.8
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 25.0 21.6
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 12.4 4.1
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 13.0 18.6
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 14.9 16.6
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 38.6 21.5
Other monetary 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 (16.8) 9.8
Other monetary 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 0.8
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 124.1 102.7
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 16.4 19.3
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 0.1 0.0
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 $ 40.2 $ 0.7