Consolidated statements of equity - USD ($) $ 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 Oct. 31, 2020	[1]			83,400,000
Beginning balance, equity at Oct. 31, 2020		$ 1.5	$ 1.5			$ 16.3	$ (14.5)	$ (0.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	[1]			11,200,000
Shares issued		21.6	21.6			21.6
Shares issued for non-cash costs (in shares)	[1]			500,000
Issuance of shares through Business Combination (in shares)	[1]			65,700,000
Issuance of shares through Business Combination		477.0	477.0			477.0
Settlement of RSUs (in shares)	[1]			400,000
Settlement of RSUs		$ 0.8	0.8			0.8
Exercise of stock options (in shares)		2,172,820		2,100,000	[1]
Exercise of stock options		$ 0.2	0.2			0.2
Stock-based compensation - RSUs		0.7	0.7			0.7
Stock-based compensation - options		2.7	2.7			2.7
Net (loss) income		(70.5)	(70.5)				(70.5)
Comprehensive (loss) income		$ (70.5)	(70.5)				(70.5)
Ending balance, common shares, outstanding (in shares) at Oct. 31, 2021		163,300,000		163,300,000	[1]
Ending balance, equity at Oct. 31, 2021		$ 434.0	434.0			519.3	(85.0)	(0.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	[1]			5,300,000
Shares issued		$ 49.7	49.7			49.7
Settlement of RSUs (in shares)	[1]			300,000
Exercise of stock options (in shares)		1,547,113		1,400,000	[1]
Exercise of warrants (in shares)	[1]			5,700,000
Exercise of warrants		$ 46.0	46.0			46.0
Stock-based compensation - RSUs		11.5	11.5			11.5
Stock-based compensation - options		6.6	6.6			6.6
Non-controlling interest in subsidiary		0.3							$ 0.3
Net (loss) income		(50.3)	(50.2)				(50.2)		(0.1)
Comprehensive (loss) income		$ (50.3)	(50.2)				(50.2)		(0.1)
Ending balance, common shares, outstanding (in shares) at Oct. 31, 2022		176,000,000		176,000,000.0	[1]
Ending balance, equity at Oct. 31, 2022		$ 497.8	497.6			633.1	(135.2)	(0.3)	0.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)		141,919		100,000	[1]
Stock-based compensation - RSUs		$ 1.6	1.6			1.6
Stock-based compensation - options		0.6	0.6			0.6
Net (loss) income		1.6	1.6				1.6
Comprehensive (loss) income		$ 1.6	1.6				1.6
Ending balance, common shares, outstanding (in shares) at Dec. 31, 2022		176,100,000		176,100,000	[1]
Ending 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)	[1]			800,000
Exercise of stock options (in shares)		1,581,424		1,300,000	[1]
Stock-based compensation - RSUs		$ 9.8	9.8			9.8
Stock-based compensation - options		3.6	3.6			3.6
Payment to the holders of non-controlling interest in subsidiary		(0.6)	(0.4)			(0.4)			(0.2)
Net (loss) income		(138.0)	(138.0)				(138.0)
Comprehensive (loss) income		$ (138.0)	(138.0)				(138.0)
Ending balance, common shares, outstanding (in shares) at Dec. 31, 2023		178,200,000		178,200,000	[1]
Ending balance, equity at Dec. 31, 2023		$ 376.4	$ 376.4			$ 648.3	$ (271.6)	$ (0.3)	$ 0.0

[1] The number of common shares has been retrospectively adjusted to reflect the reverse capitalization. See Note 1ii.