Commitments and Contingencies - Purchase Obligations (Details) $ in Millions	Dec. 31, 2022 USD ($)
Recorded Unconditional Purchase Obligation [Line Items]
Purchase obligation	$ 31.0
Concentrate manufacturing
Recorded Unconditional Purchase Obligation [Line Items]
Purchase obligation	29.4
Ancillary supplies
Recorded Unconditional Purchase Obligation [Line Items]
Purchase obligation	$ 1.6