CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Project revenue:
Energy sales	$ 45.1	$ 47.5	$ 97.6	$ 101.5
Energy capacity revenue	37.3	38.0	69.2	71.5
Other	15.8	17.6	37.8	41.4
Total project revenue	98.2	103.1	204.6	214.4
Project expenses:
Fuel	35.1	38.0	74.0	84.2
Operations and maintenance	30.0	35.3	51.2	56.8
Development				1.1
Depreciation and amortization	25.5	28.2	50.3	56.1
Total project expenses	90.6	101.5	175.5	198.2
Project other income:
Change in fair value of derivative instruments (Notes 7 and 8)	12.2	6.8	11.0	5.2
Equity in earnings of unconsolidated affiliates (Note 4)	7.6	8.6	18.3	19.3
Interest, net	(2.4)	(2.0)	(4.5)	(4.1)
Other income, net	0.2	2.2		2.2
Total project other income (expense)	17.6	15.6	24.8	22.6
Project income	25.2	17.2	53.9	38.8
Administrative and other expenses (income):
Administration	5.8	6.6	11.9	16.0
Interest, net	51.2	24.6	67.8	50.3
Foreign exchange loss (gain)	2.6	4.8	22.5	(27.4)
Other income, net (Note 6)	0.3	(1.7)	(2.2)	(3.1)
Total administrative and other expenses (income)	59.9	34.3	100.0	35.8
(Loss) income from continuing operations before income taxes	(34.7)	(17.1)	(46.1)	3.0
Income tax (benefit) expense (Note 9)	(18.4)	2.9	(16.8)	(1.7)
(Loss) income from continuing operations	(16.3)	(20.0)	(29.3)	4.7
Net loss from discontinued operations, net of tax (Note 3)		33.6		21.1
Net (loss) income	(16.3)	13.6	(29.3)	25.8
Net loss attributable to noncontrolling interests		(3.4)		(11.0)
Net income attributable to preferred shares dividends of a subsidiary company	2.2	2.3	4.2	4.6
Net (loss) income attributable to Atlantic Power Corporation	$ (18.5)	$ 14.7	$ (33.5)	$ 32.2
Basic and diluted (loss) income per share: (Note 11)
Loss from continuing operations attributable to Atlantic Power Corporation	$ (0.15)	$ (0.18)	$ (0.28)
Income from discontinued operations, net of tax		0.30		$ 0.26
Net (loss) income attributable to Atlantic Power Corporation	$ (0.15)	$ 0.12	$ (0.28)	$ 0.26
Weighted average number of common shares outstanding: (Note 11)
Basic (in shares)	121.6	121.9	121.8	121.7
Diluted (in shares)	121.6	122.1	121.8	121.9
Dividends per common share (in dollars per share)		$ 0.02		$ 0.05