Commitments and contingencies (Details) $ in Millions	Sep. 13, 2022 USD ($)	Aug. 31, 2021 USD ($) arbitration	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Lease not yet commenced, amount			$ 40.2	$ 16.2
Estimated range of loss in excess of amounts accrued			40.0
Number of arbitrations | arbitration		37
Damages sought		$ 36.4
Amount disgorged to SEC	$ 1.9
Pending Litigation
Loss Contingencies [Line Items]
Number of arbitrations | arbitration		26
Private Equity Funds
Loss Contingencies [Line Items]
Contractual obligation			$ 3.0