v3.26.1
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) - North America 401(k) Savings Plan - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Entity tax identification number 04-2835488  
Plan number 002  
Notes Receivable from Participants $ 138,231,078  
Total $ 4,723,291,318  
Investment, Identifier [Axis]: BlackRock Institutional Trust Company N.A., Equity Index Fund F, Units, Collective Investment Funds    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:BlackrockInstitutionalTrustCompanyN.a.Member  
Investment type Collective Investment Funds  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 1,767,860,942  
Investment, Identifier [Axis]: BlackRock Institutional Trust Company N.A., MSCI ACWI ex - U.S. Index Fund F, Units, Collective Investment Funds    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:BlackrockInstitutionalTrustCompanyN.a.Member  
Investment type Collective Investment Funds  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 492,346,514  
Investment, Identifier [Axis]: BlackRock Institutional Trust Company N.A., Mid Capitalization Equity Index Fund F, Units, Collective Investment Funds    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:BlackrockInstitutionalTrustCompanyN.a.Member  
Investment type Collective Investment Funds  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 252,055,360  
Investment, Identifier [Axis]: BlackRock Institutional Trust Company N.A., Russell 200 Index Fund F, Units, Collective Investment Funds    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:BlackrockInstitutionalTrustCompanyN.a.Member  
Investment type Collective Investment Funds  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 27,260,948  
Investment, Identifier [Axis]: BlackRock Institutional Trust Company N.A., U.S. Treasury Inflation Protected Securities Fund F, Units, Collective Investment Funds    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:BlackrockInstitutionalTrustCompanyN.a.Member  
Investment type Collective Investment Funds  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 18,355,108  
Investment, Identifier [Axis]: BlackRock Institutional Trust Company N.A., US Debt Index Fund F, Units, Collective Investment Funds    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:BlackrockInstitutionalTrustCompanyN.a.Member  
Investment type Collective Investment Funds  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 242,596,704  
Investment, Identifier [Axis]: BrandywineGLOBAL High Yield Fund,Shares,Mutual Fund    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name BrandywineGLOBAL High Yield Fund  
Investment type Mutual Fund  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 4,124,663  
Investment, Identifier [Axis]: Brokerage Link, Brokerage accounts    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:BrokerageLinkMember  
Investment type Self-Directed Brokerage Accounts  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 107,822,211  
Investment, Identifier [Axis]: Cohen amp; Steers U.S. Realty Fund Class A,Units,Collective Investment Funds    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:CohenSteersU.s.RealtyFundClassMember  
Investment type Collective Investment Funds  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 514,697  
Investment, Identifier [Axis]: Columbia Dividend Income Institutional,Units,Collective Investment Funds    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name Columbia Dividend Income Institutional  
Investment type Collective Investment Funds  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 119,055,694  
Investment, Identifier [Axis]: Fresenius Medical Care AG, Shares (ADRs)    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment party-in-interest true  
Investment issuer name fms:FreseniusMedicalCareAgCo.KgaaMember  
Investment type Fresenius Medical Care AG - Shares  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 14,236,904  
Investment, Identifier [Axis]: Fresenius Medical Care Stable Value Fund, Group Annuity Contract, Stable Value Separate Accounts    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment party-in-interest true  
Investment issuer name Fresenius Stable Value Fund  
Investment type fms:EmployeeBenefitPlanGroupAnnuityContractMember  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 426,380,144  
Investment, Identifier [Axis]: Fresenius T. Rowe Price Income Fund Administrative Pool Stable Value Separate Accounts    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment party-in-interest true  
Investment issuer name fms:FreseniusT.RowePriceIncomeFundAdministrativePoolMember  
Investment type Fresenius Stable Value Separate Accounts  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 519,204,028  
Investment, Identifier [Axis]: FullerThaler Behavioral Small Cap Equity Fund,Shares,Mutual Fund    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name FullerThaler Behavioral Small Cap Equity Fund Class R6  
Investment type Mutual Fund  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 166,315,192  
Investment, Identifier [Axis]: GQG Partners Emerging Markets Equity CIT Fund,Units,Collective Investment Funds    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:GqgPartnersEmergingMarketsEquityCitFundMember  
Investment type Collective Investment Funds  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 54,664,439  
Investment, Identifier [Axis]: Interest-Bearing Cash (Fidelity)    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment type Interest-Bearing Cash  
Current value $ 17,906,546  
Investment, Identifier [Axis]: Interest-Bearing Cash (Fidelity), Units    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:InterestBearingCashMember  
Investment, Identifier [Axis]: JPMorgan Large Cap Growth Fund,Shares,Mutual Fund    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:JpmorganLargeCapGrowthFundMember  
Investment type Mutual Fund  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 135,249,843  
Investment, Identifier [Axis]: Pioneer Bond Fund,Units,Collective Investment Funds    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:PioneerBondFundMember  
Investment type Collective Investment Funds  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 56,789,004  
Investment, Identifier [Axis]: Schroder International Alpha Fund,Units,Collective Investment Funds    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name fms:SchroderInternationalAlphaFundMember  
Investment type Collective Investment Funds  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 67,582,951  
Investment, Identifier [Axis]: T. Rowe Price International Discovery Administrative, Units, Collective Investment Funds    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment issuer name T. Rowe Price International Discovery Administrative  
Investment type Collective Investment Funds  
Investment participation status us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember  
Current value $ 94,738,348  
BlackRock Institutional Trust Company N.A.    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Investment party-in-interest true  
Current value $ 2,800,475,576  
Other    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Current value 393,345,133  
Mutual Fund    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Current value 305,689,698  
Stable Value Separate Accounts    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Current value $ 945,584,172  
Minimum    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Loans to participants, interest rate 4.25% 4.25%
Maximum    
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)    
Loans to participants, interest rate 10.75% 10.75%