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Commitments and contingencies (Details) $ in Millions | Sep. 13, 2022 USD ($) | Aug. 31, 2021 USD ($) arbitration | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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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 |

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