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Variable Interest Entities - Additional Information (Details) - 3 months ended Mar. 31, 2019 - Heuro Canada Incorporation
$ in Millions, $ in Millions
CAD ($)
USD ($)
CAD ($)
Variable Interest Entity [Line Items]      
Maximum exposure to loss     $ 0.6
Remaining obligation to fund operating budget $ 1.0    
Carrying amounts for assets relating to the variable interest   $ 0.0  
Carrying amounts for liabilities relating to the variable interest   $ 0.1