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Financial Instruments and Risk Management (Foreign Currency Exchange Rate Risk) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk $ (153.5) $ (176.5)
Unrealized gains $ (0.3) 0.4
Currency risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Potential percentage change in value 10.00%  
Currency risk | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk $ (678.2) (574.7)
Impact on pre-tax earnings 3.6 1.4
Currency risk | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (13.3) (58.9)
Impact on pre-tax earnings 0.3 0.4
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 (21.6) (21.3)
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 (4.1) (8.8)
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   (23.9)
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 (16.6) (7.9)
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 (21.5) (21.0)
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 (9.8) (17.2)
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 (0.8) (0.6)
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 (102.7) (83.8)
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 (19.3) (26.1)
Deferred Income Taxes | Currency risk | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (642.1) (561.2)
Deferred Income Taxes | Currency risk | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk $ (18.8) $ (62.0)