v3.19.3.a.u2
Long-term debt (Details)
$ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2020
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Long-term debt        
Long-term debt, including current portion     $ 560.4  
Less: unamortized discount     (5.8) $ (9.0)
Less: unamortized deferred financing costs     (4.7) (7.2)
Less: current maturities     (76.4) (68.1)
Total long-term debt     473.5 540.7
Long-term Debt, Fiscal Year Maturity [Abstract]        
2020     76.4  
2021     95.7  
2022     109.3  
2023     63.3  
2024     39.7  
Thereafter     176.0  
Total debt     560.4  
Senior unsecured notes, due June 2036        
Long-term debt        
Long-term Debt, Gross   $ 210.0    
Interest rate swaps        
Long-term debt        
Notional amount     468.4 616.6
Interest rate swaps | Senior secured term loan facility, due 2025        
Long-term debt        
Notional amount     370.6  
London Interbank Offered Rate (LIBOR) | Senior secured term loan facility, due 2025        
Long-term debt        
Minimum percentage of variable rate base   1.00%    
Long-term debt excluding debentures | Senior secured term loan facility, due 2025        
Long-term debt        
Long-term Debt, Gross     380.0 450.0
Less: current maturities     (72.5) (65.0)
Long-term debt excluding debentures | Senior unsecured notes, due June 2036        
Long-term debt        
Long-term Debt, Gross     $ 161.7 154.0
Interest rate (as a percent)   5.95% 5.95%  
Long-term debt excluding debentures | Cadillac term loan, due 2025        
Long-term debt        
Long-term Debt, Gross     $ 18.7 21.0
Less: current maturities     $ (3.9) $ (3.1)
Long-term debt excluding debentures | London Interbank Offered Rate (LIBOR) | Senior secured term loan facility, due 2025        
Long-term debt        
Applicable margin (as a percent)   2.75%    
Long-term debt excluding debentures | London Interbank Offered Rate (LIBOR) | Cadillac term loan, due 2025        
Long-term debt        
Applicable margin (as a percent)   1.61%    
Subsequent event        
Long-term debt        
Minimum percentage of variable rate base 1.00%      
Applicable margin (as a percent) 2.50%