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Long-term debt (Details)
CAD in Millions, $ in Millions
6 Months Ended
Jun. 30, 2017
CAD
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Long-term debt      
Less: unamortized discount   $ (14.9) $ (17.2)
Less: unamortized deferred financing costs   (12.8) (15.3)
Less: current maturities   (106.9) (111.9)
Less: current maturities   (106.9) (111.9)
Total long-term debt   707.6 749.2
Senior secured term loan facility, due 2023      
Long-term debt      
Long-term Debt, Gross   587.7 639.9
Less: current maturities   (95.0) (100.0)
Applicable margin (as a percent) 4.25%    
Senior unsecured notes, due June 2036 (Cdn$210.0)      
Long-term debt      
Long-term Debt, Gross   $ 161.8 156.4
Face amount of debt | CAD CAD 210.0    
Interest rate (as a percent) 5.95% 5.95%  
Epsilon Power Partners term facility, due 2019      
Long-term debt      
Long-term Debt, Gross   $ 10.4 13.5
Less: current maturities   (6.3) (6.2)
Cadillac term loan, due 2025      
Long-term debt      
Long-term Debt, Gross   25.5 27.0
Less: current maturities   (3.0) (3.0)
Piedmont term loan, due 2018      
Long-term debt      
Long-term Debt, Gross   56.6 56.6
Less: current maturities   (2.5) (2.5)
Applicable margin (as a percent) 3.75%    
Other long-term debt      
Long-term debt      
Long-term Debt, Gross   0.2 0.2
Less: current maturities   (0.1) (0.2)
Interest rate swaps      
Long-term debt      
Notional amount   $ 458.4 $ 506.9
Minimum | Other long-term debt      
Long-term debt      
Interest rate (as a percent) 5.50% 5.50%  
Maximum | Other long-term debt      
Long-term debt      
Interest rate (as a percent) 6.70% 6.70%  
LIBOR | Epsilon Power Partners term facility, due 2019      
Long-term debt      
Applicable margin (as a percent) 3.13%    
LIBOR | Cadillac term loan, due 2025      
Long-term debt      
Applicable margin (as a percent) 1.37%