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Revolving term credit facilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 20, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Revolving term credit facility          
Drawdowns   $ 237.0      
Repayments   (27.0)      
Balance, end of year   207.6      
Amount outstanding   207.6   $ 207.6  
Credit Facility          
Revolving term credit facility          
Balance, beginning of year   0.0      
Drawdowns   210.0      
Balance, end of year   $ 210.0 $ 0.0    
Less: debt issue costs       (2.4)  
Borrowings       207.6  
Maturity period   5 years      
Maximum borrowing capacity       1,000.0  
Amount outstanding   $ 0.0 0.0 210.0 $ 0.0
Interest expense incurred   1.5 0.0    
Debt issuance costs capitalised       $ 2.4 2.5
Amortization of debt issuance costs   0.8 0.9    
Standby and administrative fees   $ 2.2 $ 2.5    
Credit Facility | Bottom          
Revolving term credit facility          
Bankers acceptance period under credit facility   30 days      
Stamping fee (as a percent)   1.10%      
Standby fee (as a percent)   0.22%      
Credit Facility | Top          
Revolving term credit facility          
Bankers acceptance period under credit facility   180 days      
Stamping fee (as a percent)   2.20%      
Standby fee (as a percent)   0.44%      
Credit Facility | CIBC | Bottom          
Revolving term credit facility          
Spread on variable rate (as a percent)       0.10%  
Credit Facility | CIBC | Top          
Revolving term credit facility          
Spread on variable rate (as a percent)       1.20%  
Credit Facility | LIBOR          
Revolving term credit facility          
Spread on variable rate (as a percent)       1.10%  
Credit Facility | LIBOR | Bottom          
Revolving term credit facility          
Spread on variable rate (as a percent)       1.10%  
Credit Facility | LIBOR | Top          
Revolving term credit facility          
Spread on variable rate (as a percent)       2.20%  
Credit Facility | Prime rate | Bottom          
Revolving term credit facility          
Spread on variable rate (as a percent)       0.10%  
Credit Facility | Prime rate | Top          
Revolving term credit facility          
Spread on variable rate (as a percent)       1.20%  
FNBC Credit Facility          
Revolving term credit facility          
Drawdowns   $ 27.0      
Repayments   $ (27.0)      
Maturity period 1 year        
Maximum borrowing capacity $ 100.0        
Standby fee (as a percent) 0.27%        
Debt issuance costs capitalised       $ 0.1 $ 0.1
FNBC Credit Facility | CIBC          
Revolving term credit facility          
Spread on variable rate (as a percent) 0.35%        
FNBC Credit Facility | LIBOR          
Revolving term credit facility          
Spread on variable rate (as a percent) 1.35%