CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 38.8	$ 74.9
Restricted cash	7.1	7.7
Accounts receivable	31.3	30.4
Insurance recovery receivable (Note 23)		13.5
Current portion of derivative instruments asset (Notes 14 and 15)	0.4	0.7
Inventory (Note 7)	18.3	18.6
Prepayments	7.0	3.8
Income taxes receivable (Note 16)	3.2	1.8
Lease receivable		0.9
Other current assets	0.3	0.4
Total current assets	106.4	152.7
Property, plant, and equipment, net (Note 8)	491.8	502.1
Equity investments in unconsolidated affiliates (Note 6)	85.0	96.6
Power purchase agreements and intangible assets, net (Note 10)	120.3	144.3
Goodwill (Note 9)	21.3	21.3
Operating lease right-of-use assets (Note 24)	4.6	6.3
Deferred income taxes (Note 16)	17.2	10.4
Other assets	0.6	1.9
Total assets	847.2	935.6
Current liabilities:
Accounts payable	6.3	8.9
Accrued interest	2.5	2.6
Other accrued liabilities	19.3	20.8
Current portion of long-term debt (Note 12)	95.7	76.4
Current portion of derivative instruments liability (Notes 14 and 15)	11.0	12.0
Operating lease liabilities (Note 24)	1.9	2.0
Other current liabilities	0.2	0.2
Total current liabilities	136.9	122.9
Long-term debt, net of unamortized discount and deferred financing costs (Note 12)	384.1	473.5
Convertible debentures, net of discount and unamortized deferred financing costs (Note 13)	84.1	81.1
Derivative instruments liability (Notes 14 and 15)	8.1	15.9
Deferred income taxes (Note 16)		23.7
Power purchase agreements and intangible liabilities, net (Note 10)	18.0	19.8
Asset retirement obligations, net (Note 11)	48.1	51.5
Operating lease liabilities (Note 24)	3.1	4.8
Other long-term liabilities (Note 11)	6.2	4.7
Total liabilities	688.6	797.9
Equity
Common shares, no par value, unlimited authorized shares; 89,222,568 and 108,675,294 issued and outstanding at December 31, 2020 and 2019	1,219.7	1,259.9
Accumulated other comprehensive loss (Note 5)	(139.9)	(140.7)
Retained deficit	(1,090.0)	(1,164.2)
Total Atlantic Power Corporation shareholders' deficit	(10.2)	(45.0)
Preferred shares issued by a subsidiary company (Note 20)	168.8	182.7
Total equity	158.6	137.7
Total liabilities and equity	$ 847.2	$ 935.6