Commitments and contingencies (Details)				28 Months Ended
	Feb. 09, 2024 USD ($)	Feb. 07, 2024 USD ($)	Jan. 30, 2024 USD ($)	Dec. 31, 2023 USD ($) arbitration complaintant	Dec. 31, 2022 USD ($)	Sep. 13, 2022 USD ($)	Aug. 31, 2021 arbitration
Loss Contingencies [Line Items]
Contractual obligation				$ 2,400,000
Lease not yet commenced, amount				5,800,000	$ 40,200,000
Letters of credit outstanding,				0
Estimated range of loss in excess of amounts accrued				$ 23,000,000
Number of arbitrations | arbitration							48
Number of complainants | complaintant				138
Litigation settlement expense				$ 87,700,000
Estimate of possible loss amount						$ 1,900,000
Subsequent Event
Loss Contingencies [Line Items]
Litigation damages sought	$ 12,000,000
Litigation settlement amount		$ 1,000,000	$ 1,200,000
Pending Litigation
Loss Contingencies [Line Items]
Number of arbitrations | arbitration				7
Estimate of possible loss amount				$ 7,900,000
Settled Litigation
Loss Contingencies [Line Items]
Number of settled arbitrations | arbitration				41