Basic and diluted earnings (loss) per share (Tables)

6 Months Ended

Jun. 30, 2016

Basic and diluted earnings (loss) per share

Schedule of diluted net income and potentially dilutive shares utilized in the per share calculation

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Numerator:
Loss from continuing operations attributable to Atlantic Power Corporation	$	(18.5)	$	(22.3)	$	(33.5)	$	0.1
Income from discontinued operations, net of tax		—		37.0		—		32.1
Net (loss) income attributable to Atlantic Power Corporation	$	(18.5)	$	14.7	$	(33.5)	$	32.2
Denominator:
Weighted average basic shares outstanding		121.6		121.9		121.8		121.7
Dilutive potential shares:
Convertible debentures		14.8		22.6		18.3		23.0
LTIP notional units		0.1		0.2		0.1		0.2
Potentially dilutive shares		136.5		144.7		140.2		144.9
Diluted loss per share from continuing operations attributable to Atlantic Power Corporation	$	(0.15)	$	(0.18)	$	(0.28)	$	—
Diluted earnings per share from discontinued operations		—		0.30		—		0.26
Diluted (loss) earnings per share attributable to Atlantic Power Corporation	$	(0.15)	$	0.12	$	(0.28)	$	0.26