v2.4.0.8
Guarantees and condensed consolidating financial information (Details 2) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Current assets:        
Cash and cash equivalents $ 195.6 $ 60.2 $ 62.7 $ 60.7
Restricted cash 40.1 28.6    
Accounts receivable 71.4 58.5    
Prepayments, supplies, and other current assets 38.5      
Total current assets 345.6 561.7    
Property, plant, and equipment, net 1,932.3 2,055.5    
Equity investments in unconsolidated affiliates 410.4 428.7    
Other intangible assets, net 483.6 524.9    
Goodwill 331.2 334.7    
Other assets 64.3      
Total assets 3,567.4 4,002.7 3,428.6  
Current liabilities:        
Accounts payable and accrued liabilities 77.3      
Revolving credit facility   67.0    
Current portion of long-term debt 65.7 121.2    
Liabilities from discontinued operations   189.0    
Other current liabilities 39.1      
Total current liabilities 182.1 535.5    
Long-term debt 1,462.0 1,459.1    
Convertible debentures 408.3 424.2    
Other non-current liabilities 348.9      
Total liabilities 2,401.3 2,816.3    
Equity        
Common shares 1,285.4 1,285.5    
Preferred shares issued by a subsidiary company 221.3 221.3    
Accumulated other comprehensive income (loss) (19.5) 9.4    
Retained deficit (597.3) (565.2)    
Total Atlantic Power Corporation shareholders' equity 889.9 951.0    
Noncontrolling interest 276.2 235.4    
Total equity 1,166.1 1,186.4 1,007.5 1,115.8
Total liabilities and equity 3,567.4 4,002.7    
Guarantor Subsidiaries
        
Current assets:        
Cash and cash equivalents 195.6 49.8    
Restricted cash 40.1      
Accounts receivable 151.9      
Prepayments, supplies, and other current assets 36.9      
Total current assets 424.5      
Property, plant, and equipment, net 1,761.1      
Equity investments in unconsolidated affiliates 3,706.5      
Other intangible assets, net 331.3      
Goodwill 273.0      
Other assets 521.4      
Total assets 7,017.8      
Current liabilities:        
Accounts payable and accrued liabilities 97.5      
Current portion of long-term debt 65.7      
Other current liabilities 36.3      
Total current liabilities 199.5      
Long-term debt 812.0      
Convertible debentures (0.1)      
Other non-current liabilities 1,184.5      
Total liabilities 2,195.9      
Equity        
Common shares 4,302.9      
Preferred shares issued by a subsidiary company 248.2      
Accumulated other comprehensive income (loss) (19.5)      
Retained deficit 14.1      
Total Atlantic Power Corporation shareholders' equity 4,545.7      
Noncontrolling interest 276.2      
Total equity 4,821.9      
Total liabilities and equity 7,017.8      
Curtis Palmer
        
Current assets:        
Accounts receivable 23.9      
Prepayments, supplies, and other current assets 1.2      
Total current assets 25.1      
Property, plant, and equipment, net 172.5      
Other intangible assets, net 152.3      
Goodwill 58.2      
Total assets 408.1      
Current liabilities:        
Accounts payable and accrued liabilities 18.5      
Total current liabilities 18.5      
Long-term debt 190.0      
Other non-current liabilities 8.5      
Total liabilities 217.0      
Equity        
Common shares 191.1      
Total Atlantic Power Corporation shareholders' equity 191.1      
Total equity 191.1      
Total liabilities and equity 408.1      
Atlantic Power
        
Current assets:        
Cash and cash equivalents   16.9    
Accounts receivable 3.0      
Prepayments, supplies, and other current assets 1.4      
Total current assets 4.4      
Equity investments in unconsolidated affiliates 973.9      
Other assets 437.1      
Total assets 1,415.4      
Current liabilities:        
Accounts payable and accrued liabilities 68.7      
Other current liabilities 3.8      
Total current liabilities 72.5      
Long-term debt 460.0      
Convertible debentures 408.4      
Other non-current liabilities 0.5      
Total liabilities 941.4      
Equity        
Common shares 1,285.3      
Retained deficit (811.3)      
Total Atlantic Power Corporation shareholders' equity 474.0      
Total equity 474.0      
Total liabilities and equity 1,415.4      
Eliminations
        
Current assets:        
Accounts receivable (107.4)      
Prepayments, supplies, and other current assets (1.0)      
Total current assets (108.4)      
Property, plant, and equipment, net (1.3)      
Equity investments in unconsolidated affiliates (4,270.0)      
Other assets (894.2)      
Total assets (5,273.9)      
Current liabilities:        
Accounts payable and accrued liabilities (107.4)      
Other current liabilities (1.0)      
Total current liabilities (108.4)      
Other non-current liabilities (844.6)      
Total liabilities (953.0)      
Equity        
Common shares (4,493.9)      
Preferred shares issued by a subsidiary company (26.9)      
Retained deficit 199.9      
Total Atlantic Power Corporation shareholders' equity (4,320.9)      
Total equity (4,320.9)      
Total liabilities and equity $ (5,273.9)