v3.20.2
Long-term debt (Details)
$ in Millions
1 Months Ended 9 Months Ended
Aug. 24, 2020
USD ($)
Jan. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
CAD ($)
Sep. 30, 2020
USD ($)
Mar. 18, 2020
USD ($)
Mar. 17, 2020
USD ($)
Jan. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Long-term debt                    
Less: unamortized discount         $ (4,100,000)         $ (5,800,000)
Less: unamortized deferred financing costs         (4,200,000)         (4,700,000)
Less: current maturities         (91,000,000.0)         (76,400,000)
Total long-term debt         399,700,000         473,500,000
Current maturities         (91,000,000.0)         (76,400,000)
Term loan maturity   2 years                
Payments of Financing Costs     $ 1,600,000              
Shelf Registration authorized amount $ 250,000,000                  
Availability of future shelf registration period 3 years                  
Senior secured term loans | APLP Holdings                    
Long-term debt                    
Minimum percentage of variable rate base   1.00%                
Applicable margin (as a percent)   2.50%                
Write-off of deferred financing costs   $ 500,000                
Debt repriced               $ 380.0    
Interest rate margin reduction due to repricing, as a percent   0.25%                
Interest rate margin additional reduction due to repricing, as a percent   0.25%                
Payments of Financing Costs     $ 700,000              
Cadillac term loan, due 2025                    
Long-term debt                    
Debt service coverage ratio     1.20%              
Debt service coverage ratio, consecutive term     4              
Debt service coverage projected ratio     1.20%              
Debt service coverage projected ratio, consecutive term     4              
Revolver | APLP Holdings                    
Long-term debt                    
Line of Credit Facility, Amount Outstanding         0          
Borrowing capacity           $ 180,000,000 $ 200,000,000      
Payments of Financing Costs     $ 900,000              
Letters of credit | APLP Holdings                    
Long-term debt                    
Line of Credit Facility, Amount Outstanding         78,000,000.0          
Maximum | Senior secured term loans | APLP Holdings                    
Long-term debt                    
Leverage ratio as defined in Credit Agreement               2.75    
Maximum | Revolver | APLP Holdings                    
Long-term debt                    
Borrowing capacity           210,000,000        
Upsizing borrowing capacity           $ 30,000,000        
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         326,000,000.0         380,000,000.0
Current maturities         (88,000,000.0)         (72,500,000)
Long-term debt excluding debentures | Senior unsecured notes, due June 2036                    
Long-term debt                    
Long-term Debt, Gross       $ 210.0 $ 157,400,000       $ 210.0 161,700,000
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         $ 15,600,000         18,700,000
Current maturities         $ (3,000,000.0)         $ (3,900,000)
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)     2.50%              
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%