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Nonrefundable Entrance Fees Florida FLORIDA Product and Service [Axis] Product and Service [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Operator [Domain] Operator [Domain] Operator [Domain] Concentration risk (as a percent) Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] COLORADO COLORADO Life Plan Community Life Plan Community [Member] Life Plan Community Equity Awards Adjustments Equity Awards Adjustments [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Total liabilities and equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Summary of financial instruments Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Total noncontrolling interests Equity, Attributable to Noncontrolling Interest SWF SH JV SWF SH JV [Member] SWF SH JV Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related Party [Domain] Related and Nonrelated Parties [Domain] Entrance fee receivables Opening balance Closing balance Entrance Fee Receivables Entrance Fee Receivables Schedule of Opening and Closing Balances of Accounts Receivable, Net Schedule of Accounts, 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and administrative General and administrative General and Administrative Expense Proceeds from sale of property Proceeds from Sale of Buildings Adjustment to Compensation: Adjustment to Compensation [Axis] Property count Number of Real Estate Properties Real estate: Real Estate Investment Property, Net [Abstract] Net impact of change in tax status Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability Class of Stock [Domain] Class of Stock [Domain] Janus Living OP Common Units Janus Living OP Common Units [Member] Janus Living OP Common Units Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Amortization of non-refundable entrance fees Amortization Amortization Of Nonrefundable Entrance Fees 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