Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

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Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Acquisitions and divestitures Assets And Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Goodwill	$ 7,229,702	$ 7,112,560	$ 7,076,610
Goodwill deductible for tax purposes associated with acquisitions	59,521
Dialysis and other businesses
Business Acquisition [Line Items]
Current assets	33,732
Property and equipment	32,274
Right-of-use lease assets and other long-term assets	29,703
Indefinite-lived licenses	3,329
Goodwill	137,290
Liabilities assumed	(43,024)
Noncontrolling interests assumed	(20,258)
Total assets acquired and liabilities assumed	173,046
U.S. dialysis
Business Acquisition [Line Items]
Goodwill	$ 6,517,220	$ 6,416,825	$ 6,416,825