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Accounting for derivative instruments and hedging activities (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 05, 2014
USD ($)
May 05, 2014
USD ($)
Jun. 30, 2014
MMBTU
Jun. 30, 2016
USD ($)
item
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
MMBTU
item
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
MMBTU
Jun. 28, 2016
USD ($)
May 25, 2016
USD ($)
Mar. 31, 2016
Feb. 14, 2014
USD ($)
Derivative instruments                        
Derivative Number of Contracts Designated as Cash Flow Hedges | item       1   1            
Minimum fixed interest rate (as a percent) 6.00% 6.00%                    
Senior secured term loan facility, due 2021 | Long-term debt excluding debentures                        
Derivative instruments                        
Long-term debt               $ 473.2        
Adjusted Eurodollar Rate                        
Derivative instruments                        
Minimum percentage of variable rate base   1.00%                    
Applicable margin (as a percent)           5.00%            
Gas purchase agreements | Ontario project                        
Derivative instruments                        
Notional amount, energy (in gigajoules: Ontario, in Mmbtu: Orlando) | MMBTU     2,900,000                  
Gas purchase agreements | Morris Project                        
Derivative instruments                        
Notional amount, energy (in gigajoules: Ontario, in Mmbtu: Orlando) | MMBTU           1,302,000            
Expected uncontracted gas requirements for 2015 | Ontario project                        
Derivative instruments                        
Percentage of requirements whose price is fixed by derivative           100.00%            
Expected uncontracted gas requirements for 2016 | Ontario project                        
Derivative instruments                        
Percentage of requirements whose price is fixed by derivative           35.00%            
Expected uncontracted gas requirements for 2017 | Ontario project                        
Derivative instruments                        
Percentage of requirements whose price is fixed by derivative           30.00%            
Natural gas swaps                        
Derivative instruments                        
Notional amount, energy (in gigajoules: Ontario, in Mmbtu: Orlando) | MMBTU           5,700,000   2,800,000        
Natural gas swaps | Derivative instruments not designated as cash flow hedges                        
Derivative instruments                        
Gain (Loss) on Sale of Derivatives       $ 1.3 $ 1.6 $ 3.3 $ 3.0          
Natural gas swaps during remainder of 2014 | Orlando project                        
Derivative instruments                        
Notional amount, energy (in gigajoules: Ontario, in Mmbtu: Orlando) | MMBTU           5,700,000            
Percentage of the entity's share in required natural gas purchases hedge           95.00%            
Interest rate swaps                        
Derivative instruments                        
Minimum fixed interest rate (as a percent) 6.00% 6.00%                    
Notional amount       532.3   $ 532.3   $ 302.3        
Interest rate swaps | Derivative instruments not designated as cash flow hedges                        
Derivative instruments                        
Gain (Loss) on Sale of Derivatives       1.1 $ 1.0 1.7 $ 1.9          
Interest rate swaps | Adjusted Eurodollar Rate                        
Derivative instruments                        
Notional amount $ 199.0 $ 199.0   134.4   134.4            
Interest rate swaps | Adjusted Eurodollar Rate | Senior secured term loan facility, due 2021 | Long-term debt excluding debentures                        
Derivative instruments                        
Notional amount 509.0 509.0                    
Aggregate principal amount of debt $ 600.0 600.0                    
Interest rate swaps | Minimum | Adjusted Eurodollar Rate                        
Derivative instruments                        
Minimum percentage of variable rate base 1.00%                      
Interest rate swaps | APLP Holdings | New Term Loans                        
Derivative instruments                        
Notional amount                 $ 160.0 $ 150.0    
Interest rate swaps | APLP Holdings | Adjusted Eurodollar Rate | Senior secured term loan facility, due 2021                        
Derivative instruments                        
Notional amount $ 310.0 310.0   $ 674.9   $ 674.9            
Aggregate principal amount of debt $ 700.0 $ 700.0                    
Interest rate swaps | Piedmont                        
Derivative instruments                        
Long-term debt                       $ 68.5
Interest rate swaps | Swaption interest rate until February 15, 2015 | Cadillac Project                        
Derivative instruments                        
Swaption interest rate (as a percent)                     6.00%  
Interest rate swaps | Swaption interest rate from February 16, 2015 to February 15, 2019 | Cadillac Project                        
Derivative instruments                        
Swaption interest rate (as a percent)       6.10%   6.10%            
Interest rate swaps | Swaption interest rate from February 16, 2019 to February 15, 2023 | Cadillac Project                        
Derivative instruments                        
Swaption interest rate (as a percent)       6.30%   6.30%            
Interest rate swaps | Swaption interest rate after February 15, 2023 | Cadillac Project                        
Derivative instruments                        
Swaption interest rate (as a percent)       6.40%   6.40%            
Interest rate swaps | Swaption interest rate until February 29, 2016 | Piedmont                        
Derivative instruments                        
Swaption interest rate (as a percent)       1.70%   1.70%            
Applicable margin, low end of range (as a percent)       3.50%   3.50%            
Applicable margin, high end of range (as a percent)       3.80%   3.80%            
Interest rate swaps | Swaption interest rate From February, 2016 to August, 2018 | Piedmont                        
Derivative instruments                        
Swaption interest rate (as a percent)       4.47%   4.47%            
Applicable margin of derivative (as a percent)       4.00%   4.00%            
Swaption all in one interest rate (as a percent)       8.50%   8.50%            
Interest rate swaps | Swaption interest rate From August, 2018 to November, 2030 | Piedmont                        
Derivative instruments                        
Swaption interest rate (as a percent)       4.47%   4.47%