Summary of significant accounting policies - Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2022
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