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Summary of significant accounting policies - Estimated Useful Lives (Details)
Dec. 31, 2023
Buildings | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 31 years
Buildings | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 39 years
Building improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 10 years
Building improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 39 years
Furniture and equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Furniture and equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 15 years
Software | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Software | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 7 years