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Revolving term credit facility (Details)
$ in Millions
 12 Months Ended
Mar. 20, 2017
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Credit Facility      
Revolving term credit facility      
Maturity period   5 years  
Maximum borrowing capacity   $ 1,000.0  
Amount outstanding   0.0 $ 0.0
Debt issuance costs capitalised   2.5 2.2
Amortization of debt issuance costs   0.9 0.6
Standby and administrative fees   $ 2.5 $ 2.2
Credit Facility | Bottom      
Revolving term credit facility      
Bankers acceptance period under credit facility   30 days  
Stamping fee (as a percent)   1.20%  
Standby fee (as a percent)   0.24%  
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)   0.20%  
Credit Facility | CIBC | Top      
Revolving term credit facility      
Spread on variable rate (as a percent)   1.20%  
Credit Facility | LIBOR | Bottom      
Revolving term credit facility      
Spread on variable rate (as a percent)   1.20%  
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)   0.20%  
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      
Maturity period 1 year    
Maximum borrowing capacity $ 100.0    
Amount outstanding $ 0.0    
Number of additional extensions available | item 2    
Extension period available 1 year    
Standby fee (as a percent) 0.27%    
Debt issuance costs capitalised $ 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%