Acquisitions and divestitures Assets And Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Goodwill	$ 7,201,399	$ 7,112,560	$ 7,076,610
Goodwill deductible for tax purposes associated with acquisitions	60,065
Dialysis and other businesses
Business Acquisition [Line Items]
Current assets	149,308
Property and equipment	46,473
Right-of-use lease assets and other long-term assets	51,300
Indefinite-lived licenses	8,854
Goodwill	137,817
Liabilities assumed	(96,417)
Noncontrolling interests assumed	(20,258)
Total assets acquired and liabilities assumed	277,077
U.S. dialysis
Business Acquisition [Line Items]
Goodwill	$ 6,517,220	$ 6,416,825	$ 6,416,825