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Revolving term credit facilities (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 18, 2018
USD ($)
Oct. 17, 2018
USD ($)
Mar. 20, 2017
USD ($)
item
Oct. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
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           $ 2.7 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 | Subsequent borrowings under credit facilities              
Revolving term credit facility              
Proceeds from draw of Credit Facility   $ 200.0   $ 200.0      
Credit Facility | 30-day Libor | Subsequent borrowings under credit facilities              
Revolving term credit facility              
Spread on variable rate (as a percent)   1.10%          
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
FNBC Credit Facility | Subsequent borrowings under credit facilities              
Revolving term credit facility              
Proceeds from draw of Credit Facility $ 7.0            
FNBC Credit Facility | 30-day Libor | Subsequent borrowings under credit facilities              
Revolving term credit facility              
Spread on variable rate (as a percent) 1.35%