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Long-term debt (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Long-term debt    
Less: unamortized discount $ (19.7)  
Less: current maturities (96.4) $ (15.8)
Total long-term debt 807.8 682.7
Interest rate swaps    
Long-term debt    
Notional amount 532.3 302.3
London Interbank Offered Rate (LIBOR) | Interest rate swaps    
Long-term debt    
Aggregate principal amount of debt 674.9  
Long-term debt excluding debentures    
Long-term debt    
Less: unamortized deferred financing costs (17.6) (34.8)
Less: current maturities (96.4) (15.8)
Total long-term debt 807.8 682.7
Long-term debt excluding debentures | Senior secured term loan facility, due 2021    
Long-term debt    
Long-term debt   473.2
Less: current maturities   (4.7)
Long-term debt excluding debentures | Senior secured term loan facility, due 2023    
Long-term debt    
Long-term debt 674.9  
Less: current maturities $ (84.9)  
Applicable margin (as a percent) 5.00%  
Long-term debt excluding debentures | Senior unsecured notes, due June 2036 (Cdn$210.0)    
Long-term debt    
Long-term debt $ 162.6 151.7
Interest rate (as a percent) 5.95%  
Long-term debt excluding debentures | Epsilon Power Partners term facility, due 2019    
Long-term debt    
Long-term debt $ 16.5 19.5
Less: current maturities (6.1) (6.0)
Long-term debt excluding debentures | Cadillac term loan, due 2025    
Long-term debt    
Long-term debt 28.3 29.5
Less: current maturities (2.8) (2.5)
Long-term debt excluding debentures | Piedmont term loan, due 2018    
Long-term debt    
Long-term debt 59.0 59.0
Less: current maturities $ (2.4) (2.4)
Applicable margin (as a percent) 8.47%  
Long-term debt excluding debentures | Other long-term debt    
Long-term debt    
Long-term debt $ 0.2 0.4
Less: current maturities $ (0.2) $ (0.2)
Long-term debt excluding debentures | Minimum | Other long-term debt    
Long-term debt    
Interest rate (as a percent) 5.50%  
Long-term debt excluding debentures | Maximum | Other long-term debt    
Long-term debt    
Interest rate (as a percent) 6.70%  
Long-term debt excluding debentures | London Interbank Offered Rate (LIBOR) | Senior secured term loan facility, due 2021    
Long-term debt    
Minimum percentage of variable rate base 1.00%  
Applicable margin (as a percent) 3.75%  
Long-term debt excluding debentures | London Interbank Offered Rate (LIBOR) | Epsilon Power Partners term facility, due 2019    
Long-term debt    
Applicable margin (as a percent) 3.125%  
Long-term debt excluding debentures | London Interbank Offered Rate (LIBOR) | Cadillac term loan, due 2025    
Long-term debt    
Applicable margin (as a percent) 1.37%  
Long-term debt excluding debentures | London Interbank Offered Rate (LIBOR) | Interest rate swaps | Senior secured term loan facility, due 2021    
Long-term debt    
Notional amount $ 444.4