Unaudited condensed consolidated interim statements of operations and comprehensive loss - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue
Revenues	$ 8.4	$ 4.7	$ 21.0	$ 11.9
Cost of sales
Cost of sales	(20.0)	(20.1)	(57.3)	(59.4)
Selling, general and administrative expense	(12.9)	(25.9)	(58.8)	(73.5)
Research and development	(0.7)	(2.7)	(1.2)	(4.9)
Loss from operations	(25.2)	(44.0)	(96.3)	(125.9)
Other income (expense)
Interest income	0.5	2.5	2.0	11.7
Interest expense	(17.3)	(0.2)	(44.4)	(1.4)
Foreign exchange gain (loss)	(0.7)	0.1	(0.9)	(0.9)
Fair value gain on financial instruments	99.2	10.9	110.1	17.5
Debt extinguishment loss (Note 11)	0.0	0.0	(58.9)	0.0
Interest expense and other costs	81.7	13.3	7.9	26.9
Net profit (loss) before taxes	56.5	(30.7)	(88.4)	(99.0)
Income tax	0.0	0.0	0.0	(0.1)
Net profit (loss)	56.5	(30.7)	(88.4)	(99.1)
Comprehensive loss	56.5	(30.7)	(88.4)	(99.1)
Net profit (loss) and comprehensive profit (loss) attributable to
Shareholders of Li-Cycle Holdings Corp., net profit (loss)	56.5	(30.7)	(88.4)	(99.0)
Shareholders of Li-Cycle Holdings Corp., comprehensive profit (loss)	56.5	(30.7)	(88.4)	(99.0)
Non-controlling interest, net profit (loss)	0.0	0.0	0.0	(0.1)
Non-controlling interest, comprehensive profit (loss)	$ 0.0	$ 0.0	$ 0.0	$ (0.1)
Profit (loss) per common share - basic (in dollars per share)	$ 2.15	$ (1.38)	$ (3.81)	$ (4.47)
Profit (loss) per common share - diluted (in dollars per share)	$ 2.43	$ (1.38)	$ (3.81)	$ (4.47)
Product revenue
Revenue
Revenues	$ 4.4	$ 3.5	$ 11.5	$ 9.7
Cost of sales
Cost of sales	(19.4)	(20.1)	(54.3)	(59.4)
Recycling service revenue
Revenue
Revenues	4.0	1.2	9.5	2.2
Cost of sales
Cost of sales	$ (0.6)	$ 0.0	$ (3.0)	$ 0.0