v3.3.1.900
Long-term debt - instruments (Details)
CAD in Millions, $ in Millions
12 Months Ended 24 Months Ended
May. 05, 2014
Feb. 26, 2014
USD ($)
Feb. 24, 2014
CAD
Dec. 31, 2015
CAD
Dec. 31, 2015
CAD
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
Feb. 24, 2014
USD ($)
Long-term debt                  
Long-term debt           $ 733.3      
Senior Secured Credit Facilities | The Partnership                  
Long-term debt                  
Debt service reserve requirement period     6 months            
Debt service reserve requirement amount                 $ 15.8
Leverage ratio of total debt to adjusted EBITDA in 2014     5.25            
Leverage ratio of total debt to adjusted EBITDA in 2021     4.00            
Interest coverage ratio of adjusted EBITDA to cash interest expense in 2014     2.50            
Interest coverage ratio of adjusted EBITDA to cash interest expense in 2021     3.25            
Mandatory prepayment as a percentage of excess cash flows     50.00%            
Senior Secured Credit Facilities | The Partnership | Repayment of loan facility within one year                  
Long-term debt                  
Debt Instrument, Redemption Price, Percentage     101.00%            
Senior Secured Credit Facilities | Minimum | The Partnership                  
Long-term debt                  
Applicable margin (as a percent)     2.75%            
Senior Secured Credit Facilities | Maximum | The Partnership                  
Long-term debt                  
Applicable margin (as a percent)     3.75%            
Senior secured term loan, due 2021                  
Long-term debt                  
Long-term debt           473.2 $ 541.5    
Senior secured term loan, due 2021 | The Partnership                  
Long-term debt                  
Maximum borrowing capacity                 600.0
Amount drawn under facility   $ 600.0              
Senior secured term loan, due 2021 | London Interbank Offered Rate (LIBOR)                  
Long-term debt                  
Applicable margin (as a percent)       3.75% 3.75%        
Minimum variable rate, as a percent       1.00%          
Senior secured term loan, due 2021 | London Interbank Offered Rate (LIBOR) | The Partnership                  
Long-term debt                  
Applicable margin (as a percent)     3.75%            
Minimum variable rate, as a percent       1.00%          
Senior secured term loan, due 2021 | London Interbank Offered Rate (LIBOR) | Minimum | Interest rate swaps                  
Long-term debt                  
Minimum variable rate, as a percent 1.00%                
Senior secured term loan, due 2021 | London Interbank Offered Rate (LIBOR) | Minimum | The Partnership                  
Long-term debt                  
Minimum variable rate, as a percent     1.00%            
Senior secured term loan, due 2021 | Base Rate | The Partnership                  
Long-term debt                  
Applicable margin (as a percent)     2.75% 3.75%          
Revolving credit facility | The Partnership                  
Long-term debt                  
Maximum borrowing capacity                 $ 210.0
Period preceding the maturity of debt for voluntarily prepayment or repurchase of any outstanding debt     30 days            
Commitment fee (as a percent)     0.75%            
Debt service reserve requirement amount   15.8              
Letters of credit issued but not drawn   $ 144.1       $ 104.0      
Senior unsecured notes, due June 2036                  
Long-term debt                  
Interest rate (as a percent)       5.95% 5.95% 5.95%      
Long-term debt       CAD 210.0 CAD 210.0 $ 151.7 181.0    
Senior unsecured notes, due June 2036 | The Partnership                  
Long-term debt                  
Maximum borrowing capacity | CAD     CAD 210.0            
Interest rate (as a percent)     5.95%           5.95%
Senior unsecured notes due 2018                  
Long-term debt                  
Interest rate (as a percent)       9.00% 9.00% 9.00%      
Long-term debt             319.9    
Epsilon Power Partners term facility, due 2019                  
Long-term debt                  
Long-term debt           $ 19.5 25.5    
Epsilon Power Partners term facility, due 2019 | London Interbank Offered Rate (LIBOR)                  
Long-term debt                  
Applicable margin (as a percent)       3.125% 3.125%        
Cadillac term loan, due 2025                  
Long-term debt                  
Long-term debt           29.5 33.4    
Cadillac term loan, due 2025 | London Interbank Offered Rate (LIBOR)                  
Long-term debt                  
Applicable margin (as a percent)       1.37% 1.37%        
Piedmont term loan, due 2018                  
Long-term debt                  
Long-term debt           59.0 64.0    
Piedmont term loan, due 2018 | London Interbank Offered Rate (LIBOR)                  
Long-term debt                  
Applicable margin (as a percent)       3.50% 3.50%        
Other long-term debt                  
Long-term debt                  
Long-term debt           $ 0.4 $ 0.6    
Other long-term debt | Minimum                  
Long-term debt                  
Interest rate (as a percent)       5.50% 5.50% 5.50%   5.50%  
Other long-term debt | Maximum                  
Long-term debt                  
Interest rate (as a percent)       6.70% 6.70% 6.70%