XML 58 R46.htm IDEA: XBRL DOCUMENT v3.8.0.1
Basic and diluted loss per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net loss attributable to Atlantic Power Corporation $ (32.9) $ (82.4) $ (57.5) $ (116.2)
Denominator:        
Weighted average basic shares outstanding 115.3 119.3 115.1 120.9
Dilutive potential shares:        
Convertible debentures (in shares) 8.1 8.1 8.1 14.9
LTIP notional units (in shares)   0.1   0.1
Potentially dilutive shares 123.4 127.5 123.2 135.9
Basic and diluted loss per share attributable to Atlantic Power Corporation $ (0.29) $ (0.69) $ (0.50) $ (0.96)