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Debt (Details)
$ in Millions
6 Months Ended 12 Months Ended
Mar. 20, 2017
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2020
CAD ($)
Jun. 30, 2020
USD ($)
Apr. 17, 2019
USD ($)
Revolving term credit facility            
Size of facility         $ 1,260,000,000  
Balance, beginning of year   $ 80,000,000 $ 210,000,000      
Drawdowns     435,000,000      
Repayments   (80,000,000) (565,000,000)      
Balance, end of year     80,000,000      
Amount outstanding   $ 80,000,000 80,000,000      
Credit Facility            
Revolving term credit facility            
Balance, beginning of year     210,000,000      
Drawdowns     275,000,000      
Repayments     (485,000,000)      
Maximum borrowing capacity         $ 1,000,000,000  
Amount outstanding     210,000,000      
Credit Facility | Bottom            
Revolving term credit facility            
Bankers acceptance period under credit facility   30 days        
Stamping fee (as a percent)   1.00%        
Standby fee (as a percent)   0.20%        
Credit Facility | Top            
Revolving term credit facility            
Bankers acceptance period under credit facility   180 days        
Stamping fee (as a percent)   2.05%        
Standby fee (as a percent)   0.41%        
Credit Facility | CIBC | Bottom            
Revolving term credit facility            
Spread on variable rate (as a percent)       0.00% 0.00%  
Credit Facility | CIBC | Top            
Revolving term credit facility            
Spread on variable rate (as a percent)       1.05% 1.05%  
Credit Facility | LIBOR | Bottom            
Revolving term credit facility            
Spread on variable rate (as a percent)       1.00% 1.00%  
Credit Facility | LIBOR | Top            
Revolving term credit facility            
Spread on variable rate (as a percent)       2.05% 2.05%  
Credit Facility | Prime rate | Bottom            
Revolving term credit facility            
Spread on variable rate (as a percent)       0.00% 0.00%  
Credit Facility | Prime rate | Top            
Revolving term credit facility            
Spread on variable rate (as a percent)       1.05% 1.05%  
Term Loan            
Revolving term credit facility            
Balance, beginning of year   $ 80,000,000        
Drawdowns     160,000,000      
Repayments   (80,000,000) (80,000,000)      
Balance, end of year     80,000,000      
Amount outstanding   $ 80,000,000 $ 80,000,000      
Borrowed amount         $ 160,000,000 $ 160,000,000
Term Loan | 30-day Libor            
Revolving term credit facility            
Spread on variable rate (as a percent)           0.85%
FNBC Credit Facility            
Revolving term credit facility            
Maturity period 1 year          
Maximum borrowing capacity $ 100,000,000       $ 100,000,000  
Standby fee (as a percent)   0.25%        
FNBC Credit Facility | CIBC            
Revolving term credit facility            
Spread on variable rate (as a percent)       0.25% 0.25%  
FNBC Credit Facility | LIBOR            
Revolving term credit facility            
Spread on variable rate (as a percent)       1.25% 1.25%  
Letter of credit            
Revolving term credit facility            
Maximum borrowing capacity       $ 23.1 $ 17,000,000  
Number of letter of credit   $ 2