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Financial Instruments and Risk Management (Foreign Currency Exchange Rate Risk) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk $ (176.5) $ (228.1)
Unrealized gains $ 0.4 0.7
Currency risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Potential percentage change in value 10.00%  
Currency risk [member] | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk $ 574.7 458.0
Impact on pre-tax earnings 1.4 3.3
Currency risk [member] | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk 58.9 54.3
Impact on pre-tax earnings 0.4 0.4
Cash and Cash Equivalents [Member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk   (220.5)
Cash and Cash Equivalents [Member] | Currency risk [member] | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (21.3) (33.5)
Cash and Cash Equivalents [Member] | Currency risk [member] | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (8.8) (6.5)
Equity Securities [Member] | Currency risk [member] | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (23.9) (43.7)
Equity Securities [Member] | Currency risk [member] | 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 [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (4.0) (7.6)
Trade receivables [member] | Currency risk [member] | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (7.9) (6.9)
Trade receivables [member] | Currency risk [member] | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (21.0) (18.7)
Other monetary assets [member] | Currency risk [member] | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (17.2) (20.2)
Other monetary assets [member] | Currency risk [member] | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk 0.6 (4.1)
Accounts Payable And Accrued Liabilities [Member] | Currency risk [member] | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (83.8) (71.7)
Accounts Payable And Accrued Liabilities [Member] | Currency risk [member] | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (26.1) (25.4)
Deferred Income Taxes | Currency risk [member] | Canadian dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk (561.2) (490.6)
Deferred Income Taxes | Currency risk [member] | Mexican peso    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Total financial instrument exposure to credit risk $ (62.0) $ (58.2)