v3.26.3
Debt - Janus Living Credit Facilities, Bank Line of Credit and Term Loan (Details)
1 Months Ended 9 Months Ended
Mar. 23, 2026
USD ($)
renewal_option
Oct. 31, 2026
USD ($)
Oct. 31, 2025
Sep. 30, 2026
USD ($)
derivative_held
renewal_option
Nov. 03, 2026
USD ($)
Mar. 31, 2026
USD ($)
Feb. 28, 2026
USD ($)
Dec. 31, 2025
USD ($)
Interest rate swap instruments | Designated as Hedging Instrument                
Debt Instrument                
Number of interest-rate contracts held | derivative_held       2        
Interest rate swap instruments | Designated as Hedging Instrument | Cash Flow Hedging                
Debt Instrument                
Number of interest-rate contracts held | derivative_held       2        
Janus Living Credit Facilities | Bank Line  of Credit                
Debt Instrument                
Debt issuance costs, net       $ 6,000,000        
Debt instrument, covenant debt to assets (as a percent) 60.00%              
Debt instrument, covenant secured debt to assets (as a percent) 40.00%              
Debt instrument, covenant unsecured debt to unencumbered assets (as a percent) 60.00%              
Debt instrument, covenant minimum fixed charge coverage ratio 1.5              
Debt instrument, covenant net worth, minimum $ 2,040,000,000.00              
Percentage of net proceeds received 75.00%              
Minimum unsecured interest coverage ratio 1.75              
Term Loan Agreement                
Debt Instrument                
Line of credit facility, maximum borrowing capacity       2,000,000,000.0   $ 2,000,000,000.0 $ 1,500,000,000  
Bank line of credit and commercial paper       $ 1,250,000,000       $ 1,250,000,000
Debt instrument, covenant debt to assets (as a percent)       60.00%        
Debt instrument, covenant secured debt to assets (as a percent)       40.00%        
Debt instrument, covenant unsecured debt to unencumbered assets (as a percent)       60.00%        
Debt instrument, covenant minimum fixed charge coverage ratio       1.5        
Debt instrument, covenant net worth, minimum       $ 7,700,000,000        
Term Loan Agreement | Subsequent Event                
Debt Instrument                
Line of credit facility, maximum borrowing capacity   $ 2,750,000,000            
Unsecured Term Loan                
Debt Instrument                
Aggregate principal amount       750,000,000        
Unused borrowing capacity, amount       $ 750,000,000        
2029 Term Loan | Unsecured Term Loan                
Debt Instrument                
Debt instrument, basis spread on variable rate (as a percent)       0.85%        
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]       Secured Overnight Financing Rate (SOFR) [Member]        
2029 Term Loan | Senior Unsecured Term Loan                
Debt Instrument                
Interest rate, effective (as a percent)       4.56%        
2031 Term Loan | Unsecured Term Loan                
Debt Instrument                
Debt instrument, basis spread on variable rate (as a percent)       0.80%        
2028 Term Loan | Senior Unsecured Term Loan                
Debt Instrument                
Aggregate principal amount       $ 400,000,000        
Debt instrument, basis spread on variable rate (as a percent)     0.10% 0.90%        
2028 Term Loan | Senior Unsecured Term Loan | Minimum                
Debt Instrument                
Debt instrument, basis spread on variable rate (as a percent)       0.85%        
2028 Term Loan | Senior Unsecured Term Loan | Maximum                
Debt Instrument                
Debt instrument, basis spread on variable rate (as a percent)       1.65%        
2028 Term Loan | Senior Unsecured Term Loan | Interest rate swap instruments | Designated as Hedging Instrument | Cash Flow Hedging                
Debt Instrument                
Number of interest-rate contracts held | derivative_held       3        
Revolving Credit Facility | Bank Line  of Credit                
Debt Instrument                
Line of credit facility, maximum borrowing capacity       $ 3,000,000,000.0        
Number of extensions | renewal_option       2        
Length of debt instrument extension period (in months)       6 months        
Debt instrument, basis spread on variable rate (as a percent)     0.10%          
Debt instrument, facility fee (as a percent)       0.15%        
Bank line of credit and commercial paper       $ 0       $ 0
Line of credit facility additional aggregate amount, maximum       $ 750,000,000        
Revolving Credit Facility | Bank Line  of Credit | Variable Rate Component One                
Debt Instrument                
Debt instrument, basis spread on variable rate (as a percent)       0.78%        
Revolving Credit Facility | Janus Living Credit Facilities | Bank Line  of Credit                
Debt Instrument                
Line of credit facility, maximum borrowing capacity $ 500,000,000     $ 1,250,000,000        
Number of extensions | renewal_option 2              
Length of debt instrument extension period (in months) 6 months              
Debt instrument, basis spread on variable rate (as a percent) 1.05%              
Line of credit facility, increase limit       500,000,000        
Line of credit facility, higher borrowing capacity option       $ 1,750,000,000        
Debt instrument, facility fee (as a percent)       0.15%        
Bank line of credit and commercial paper       $ 0        
Delayed Draw Term Loan (DDTL) | Janus Living Credit Facilities | Bank Line  of Credit                
Debt Instrument                
Aggregate principal amount $ 100,000,000     $ 100,000,000        
2027 Term Loan Facilities | Term Loan Agreement | Interest rate swap instruments                
Debt Instrument                
Interest rate, effective (as a percent)       3.65%        
2027 Term Loan Facilities | Term Loan Agreement | Bank Line  of Credit                
Debt Instrument                
Aggregate principal amount       $ 500,000,000        
Number of extensions | renewal_option       1        
Length of debt instrument extension period (in months)       1 year        
Debt instrument, basis spread on variable rate (as a percent)     0.10% 0.84%        
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]       Secured Overnight Financing Rate (SOFR) [Member]        
Debt Instrument, interest rate, reduction available for sustainability metrics (as a percent)       0.0001        
2027 Term Loan Facilities One | Term Loan Agreement | Bank Line  of Credit                
Debt Instrument                
Line of credit facility, maximum borrowing capacity       $ 250,000,000        
2027 Term Loan Facilities Two | Term Loan Agreement | Bank Line  of Credit                
Debt Instrument                
Line of credit facility, maximum borrowing capacity       250,000,000        
2031 Term Loan Facility | Unsecured Delayed Draw Term Loan                
Debt Instrument                
Aggregate principal amount           $ 400,000,000    
Bank line of credit and commercial paper       $ 0        
2028 Term Loan Facilities | Term Loan Agreement | Interest rate swap instruments                
Debt Instrument                
Interest rate, effective (as a percent)       4.35%        
2030 Term Loan Facility | Term Loan Agreement | Subsequent Event                
Debt Instrument                
Bank line of credit and commercial paper         $ 0      
2030 Term Loan Facility | Unsecured Delayed Draw Term Loan | Subsequent Event                
Debt Instrument                
Aggregate principal amount   $ 500,000,000            
Debt instrument, term (in months)   4 years