Unaudited condensed consolidated interim statements of equity - USD ($) shares in Millions, $ in Millions	Total	Equity attributable to the shareholders of Li-Cycle Holdings Corp.	Number of common shares	Common stock and additional paid-in capital	Accumulated deficit	Accumulated other comprehensive loss	Non-controlling interest
Beginning balance, common shares, outstanding (in shares) at Dec. 31, 2022			176.1
Beginning balance, equity at Dec. 31, 2022	$ 501.6	$ 501.4		$ 635.3	$ (133.6)	$ (0.3)	$ 0.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Settlement of RSUs (in shares)			0.4
Stock-based compensation - RSUs	2.7	2.7		2.7
Stock-based compensation - options	0.7	0.7		0.7
Net (loss) income	(36.5)	(36.5)			(36.5)
Comprehensive (loss) income	(36.5)	(36.5)			(36.5)
Ending balance, common shares, outstanding (in shares) at Mar. 31, 2023			176.5
Ending balance, equity at Mar. 31, 2023	$ 468.5	468.3		638.7	(170.1)	(0.3)	0.2
Beginning balance, common shares, outstanding (in shares) at Dec. 31, 2023	178.2		178.2
Beginning balance, equity at Dec. 31, 2023	$ 376.4	376.4		648.3	(271.6)	(0.3)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Settlement of RSUs (in shares)			0.9
Stock-based compensation - RSUs	2.7	2.7		2.7
Stock-based compensation - options	0.6	0.6		0.6
Net (loss) income	(136.7)	(136.7)			(136.7)
Comprehensive (loss) income	$ (136.7)	(136.7)			(136.7)
Ending balance, common shares, outstanding (in shares) at Mar. 31, 2024	179.1		179.1
Ending balance, equity at Mar. 31, 2024	$ 243.0	$ 243.0		$ 651.6	$ (408.3)	$ (0.3)	$ 0.0