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Income taxes - Other (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Reconciliation of income taxes        
Enacted statutory income tax rate 27.00% 27.00% 27.00% 27.00%
Tax expense $ 1.2 $ 1.6 $ 2.7 $ 2.2
Computed income tax (benefit) expense at Canadian statutory rate 0.8 1.2 6.0 2.0
Impact related to withholding and state taxes   0.4 0.6 0.8
Impact related to change in estimates 2.7   2.7  
Other permanent differences 0.5 0.2 1.2 0.3
Valuation allowance 136.6   136.6  
Increase (decrease) in the valuation allowance 0.2 1.5 (8.9)  
Foreign exchange 1.0 1.7 1.1 $ 0.9
Canada        
Reconciliation of income taxes        
Increase (decrease) in the valuation allowance 2.1 3.7 (3.8)  
United States        
Reconciliation of income taxes        
Increase (decrease) in the valuation allowance $ 2.3 $ (2.2) $ (5.1)