v2.4.0.8
Basic and diluted earnings (loss) per share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Loss from continuing operations attributable to Atlantic Power Corporation $ (40.9) $ (26.5) $ (31.8) $ (103.7)
Income (loss) from discontinued operations, net of tax (0.4) 19.0 (6.1) 48.8
Net loss attributable to Atlantic Power Corporation $ (41.3) $ (7.5) $ (37.9) $ (54.9)
Denominator:        
Weighted average basic shares outstanding 120.0 119.0 119.8 115.4
Dilutive potential shares:        
Convertible debentures (in shares) 27.7 20.5 27.7 15.7
LTIP notional units (in shares) 0.8 0.5 0.7 0.5
Potentially dilutive shares 148.5 140.0 148.2 131.6
Diluted loss per share from continuing operations attributable to Atlantic Power Corporation (in dollars per share) $ (0.34) $ (0.22) $ (0.27) $ (0.90)
Diluted earnings (loss) per share from discontinued operations (in dollars per share) $ 0.00 $ 0.16 $ (0.05) $ 0.42
Net loss attributable to Atlantic Power Corporation (in dollars per share) $ (0.34) $ (0.06) $ (0.32) $ (0.48)