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Basis of Preparation and Significant Accounting Policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Disclosure of detailed information about intangible assets [line items]        
Land rights $ 10.1 $ 10.5    
IFRS 16        
Disclosure of detailed information about intangible assets [line items]        
Land rights       $ 113.0
Lease liabilities       $ 113.0
Options        
Disclosure of detailed information about intangible assets [line items]        
Vesting period 4 years      
RSUs        
Disclosure of detailed information about intangible assets [line items]        
Vesting period 3 years      
PSUs        
Disclosure of detailed information about intangible assets [line items]        
Vesting period 3 years      
Percentage of awards granted recorded based on market value of subordinate voting shares   40.00% 40.00%  
Award requisite service period 3 years      
Percentage of awards granted recorded using Monte Carlo simulation model   60.00% 60.00%  
25% vested in year 1 | Options        
Disclosure of detailed information about intangible assets [line items]        
Vesting percentage 25.00%      
25% vested in year 2 | Options        
Disclosure of detailed information about intangible assets [line items]        
Vesting percentage 25.00%      
25% vested in year 3 | Options        
Disclosure of detailed information about intangible assets [line items]        
Vesting percentage 25.00%      
25% vested in year 4 | Options        
Disclosure of detailed information about intangible assets [line items]        
Vesting percentage 25.00%      
33.33% vested in year 1 | RSUs        
Disclosure of detailed information about intangible assets [line items]        
Vesting percentage 33.00%      
33.33% vested in year 2 | RSUs        
Disclosure of detailed information about intangible assets [line items]        
Vesting percentage 33.00%      
33.33% vested in year 3 | RSUs        
Disclosure of detailed information about intangible assets [line items]        
Vesting percentage 33.00%      
Bottom of range | PSUs        
Disclosure of detailed information about intangible assets [line items]        
Vesting percentage 0.00%      
Bottom of range | DSUs        
Disclosure of detailed information about intangible assets [line items]        
Percentage of annual fees paid to Board of Directors paid in form of awards 75.00%      
Top of range | PSUs        
Disclosure of detailed information about intangible assets [line items]        
Vesting percentage 200.00%      
Top of range | DSUs        
Disclosure of detailed information about intangible assets [line items]        
Percentage of annual fees paid to Board of Directors paid in form of awards 100.00%      
Intellectual property | Bottom of range        
Disclosure of detailed information about intangible assets [line items]        
Useful life of intangible assets 3 years      
Intellectual property | Top of range        
Disclosure of detailed information about intangible assets [line items]        
Useful life of intangible assets 5 years      
Other intangible assets | Bottom of range        
Disclosure of detailed information about intangible assets [line items]        
Useful life of intangible assets 4 years      
Other intangible assets | Top of range        
Disclosure of detailed information about intangible assets [line items]        
Useful life of intangible assets 15 years      
Computer software assets | Bottom of range        
Disclosure of detailed information about intangible assets [line items]        
Useful life of intangible assets 1 year      
Computer software assets | Top of range        
Disclosure of detailed information about intangible assets [line items]        
Useful life of intangible assets 10 years      
Buildings        
Disclosure of detailed information about intangible assets [line items]        
Useful life of property, plant and equipment 40 years      
Building/leasehold improvements | Top of range        
Disclosure of detailed information about intangible assets [line items]        
Useful life of property, plant and equipment 40 years      
Machinery and equipment | Bottom of range        
Disclosure of detailed information about intangible assets [line items]        
Useful life of property, plant and equipment 3 years      
Machinery and equipment | Top of range        
Disclosure of detailed information about intangible assets [line items]        
Useful life of property, plant and equipment 15 years