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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Value of Goodwill by Reportable Segments
Changes in the carrying amount of goodwill by reportable segment were as follows:
 U.S. dialysisOther - Ancillary
services		Consolidated
Balance at December 31, 2022$6,416,825 $659,785 $7,076,610 
Acquisitions— 25,723 25,723 
Impairment charges— (26,083)(26,083)
Foreign currency and other adjustments— 36,310 36,310 
Balance at December 31, 2023$6,416,825 $695,735 $7,112,560 
Acquisitions102,082 246,987 349,069 
Divestitures(1,687)(1,506)(3,193)
Foreign currency and other adjustments— (83,220)(83,220)
Balance at December 31, 2024$6,517,220 $857,996 $7,375,216 
Balance at December 31, 2024:
Goodwill$6,517,220 $999,817 $7,517,037 
Accumulated impairment charges— (141,821)(141,821)
$6,517,220 $857,996 $7,375,216