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Commitments and contingencies (Details) Lease in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) Tenant Lease | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Concentration Risk [Line Items] |  |  |
Discretionary profit sharing contributions subject to statutory limitations | $ 8.6 | $ 8.7 | $ 5.0
Concentration of credit risk |  |  |
Number of leases held | Lease | 1 |  |
Commitments |  |  |
Remaining aggregate costs under contracts, under terms of leases | $ 1,900.0 |  |
Letters of credit and performance obligations | 29.5 |  |
Investment commitments | $ 413.6 |  |
Limited Partnership Maximum Expiration Terms | 11 years |  |
Weighted-average remaining liquidation term (in years) | 5 years 4 months 24 days |  |
Minimum |  |  |
Commitments |  |  |
Expected period of payment obligation | 1 year |  |
Maximum |  |  |
Commitments |  |  |
Expected period of payment obligation | 3 years |  |
Three Largest Tenants | Lessee Concentration | Annualized Base Rent |  |  |
Concentration of credit risk |  |  |
Number of largest tenants | Tenant | 3 |  |
Concentration risk, percentage | 13.10% |  |
First Largest Tenant | Lessee Concentration | Annualized Base Rent |  |  |
Concentration of credit risk |  |  |
Concentration risk, percentage | 5.70% |  |
Second Largest Tenant | Lessee Concentration | Annualized Base Rent |  |  |
Concentration of credit risk |  |  |
Concentration risk, percentage | 4.30% |  |
Third Largest Tenant | Lessee Concentration | Annualized Base Rent |  |  |
Concentration of credit risk |  |  |
Concentration risk, percentage | 3.10% |  |
Investments in privately held entities that report NAV |  |  |
Commitments |  |  |
Weighted-average remaining liquidation term (in years) | 8 years 2 months 12 days |  |

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