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Financial Instruments and Risk Management (Currency Contracts) (Details)
$ in Millions, $ in Millions, $ in Millions
 12 Months Ended
Jan. 07, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
$ / $
Dec. 31, 2019
$ / $
Disclosure of detailed information about hedged items [line items]                
Gains (losses) on change in fair value of derivatives $ 3.9              
Collars and Forwards [Member]                
Disclosure of detailed information about hedged items [line items]                
Financial assets, at fair value         $ 3.3      
Financial liabilities, at fair value     $ 4.7          
Gains (losses) on change in fair value of derivatives   $ 1.5 $ (3.9)          
2019 [member] | Collars [Member] | Currency risk [member]                
Disclosure of detailed information about hedged items [line items]                
Notional amount       $ 177.0   $ 1,005.0    
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             1957.00% 131.00%
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             2212.00% 135.00%