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Revolving term credit facilities (Details)
$ in Millions
 3 Months Ended
Mar. 20, 2017
USD ($)
item
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Credit Facility      
Revolving term credit facility      
Term of credit facility   5 years  
Maximum borrowing capacity   $ 1,000.0  
Amount outstanding   0.0 $ 0.0
Debt issuance costs capitalised   $ 3.0 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 | 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      
Maturity period 1 year    
Maximum borrowing capacity $ 100.0    
Proceeds from draw of Credit Facility   $ 20.0  
Repayment of credit facility   20.0  
Amount outstanding   0.0 0.0
Number of additional extensions available | item 1    
Extension period available 1 year    
Debt issuance costs capitalised   $ 0.1 $ 0.1