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Financial Instruments and Risk Management (Currency Contracts) (Details)
$ in Millions, $ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
$ / $
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
$ / $
Collars and Forwards [Member]            
Disclosure of detailed information about hedged items [line items]            
Financial liabilities, at fair value   $ 3.3        
Gains (losses) on change in fair value of derivatives $ 1.4 $ (1.5)        
2019 [member] | Collars [Member] | Currency risk [member]            
Disclosure of detailed information about hedged items [line items]            
Notional amount     $ 45.0   $ 1,185.0  
Bottom of range [member] | 2019 [member] | Collars [Member] | Currency risk [member]            
Disclosure of detailed information about hedged items [line items]            
Average rate of hedging instrument       131.00%   2096.00%
Top of range [member] | 2019 [member] | Collars [Member] | Currency risk [member]            
Disclosure of detailed information about hedged items [line items]            
Average rate of hedging instrument       138.00%   2528.00%