Summary of significant accounting policies - Schedule of Principal Subsidiaries (Details)	Dec. 31, 2023	Jun. 29, 2023	Mar. 31, 2022	Jan. 26, 2022
Li-Cycle Corp.
Subsidiary or Equity Method Investee [Line Items]
Ownership interest	100.00%
Li-Cycle Americas Corp.
Subsidiary or Equity Method Investee [Line Items]
Ownership interest	100.00%
Li-Cycle U.S. Inc.
Subsidiary or Equity Method Investee [Line Items]
Ownership interest	100.00%
Li-Cycle Inc.
Subsidiary or Equity Method Investee [Line Items]
Ownership interest	100.00%
Li-Cycle North America Hub, Inc.
Subsidiary or Equity Method Investee [Line Items]
Ownership interest	100.00%
Li-Cycle Europe AG
Subsidiary or Equity Method Investee [Line Items]
Ownership interest	100.00%
Li-Cycle APAC PTE. LTD.
Subsidiary or Equity Method Investee [Line Items]
Ownership interest	100.00%
Li-Cycle Germany GmbH
Subsidiary or Equity Method Investee [Line Items]
Ownership interest	100.00%
Li-Cycle France SARL
Subsidiary or Equity Method Investee [Line Items]
Ownership interest	100.00%
Li-Cycle United Kingdom Ltd.
Subsidiary or Equity Method Investee [Line Items]
Ownership interest	100.00%
Li-Cycle Norway AS
Subsidiary or Equity Method Investee [Line Items]
Ownership interest	100.00%	100.00%	67.00%	67.00%