CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
Net (loss) income	$ (16.3)	$ 13.6	$ (29.3)	$ 25.8
Other comprehensive (loss) income, net of tax
Unrealized (loss) gain on hedging activities	(0.2)	0.2	(0.7)	(0.4)
Net amount reclassified to earnings	0.2	0.1	0.4	0.4
Net unrealized gain (loss) on derivatives		0.3	(0.3)
Foreign currency translation adjustments	1.0	4.5	19.4	(30.6)
Other comprehensive income (loss), net of tax	1.0	4.8	19.1	(30.6)
Comprehensive (loss) income (loss)	(15.3)	18.4	(10.2)	(4.8)
Less: Comprehensive income (loss) attributable to noncontrolling interests	2.2	(1.1)	4.2	(6.4)
Comprehensive (loss) income attributable to Atlantic Power Corporation	$ (17.5)	$ 19.5	$ (14.4)	$ 1.6