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Basic and diluted earnings (loss) per share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Income (loss) from continuing operations attributable to Atlantic Power Corporation $ (2.3) $ (24.4) $ 3.3 $ (78.3)
Income (loss) from discontinued operations, net of tax (0.7) 19.3 0.2 30.9
Net income (loss) attributable to Atlantic Power Corporation $ (3.0) $ (5.1) $ 3.5 $ (47.4)
Denominator:        
Weighted average basic shares outstanding 119.9 113.7 119.7 113.6
Dilutive potential shares:        
Convertible debentures (in shares) 27.7 13.3 27.7 13.3
LTIP notional units (in shares) 0.8 0.5 0.6 0.5
Potentially dilutive shares 148.4 127.5 148.0 127.4
Diluted earnings (loss) per share from continuing operations attributable to Atlantic Power Corporation (in dollars per share) $ (0.02) $ (0.21) $ 0.03 $ (0.69)
Diluted earnings (loss) per share from discontinued operations (in dollars per share) $ (0.01) $ 0.17 $ 0.00 $ 0.27
Net income (loss) attributable to Atlantic Power Corporation (in dollars per share) $ (0.03) $ (0.04) $ 0.03 $ (0.42)