v3.26.3
Investments in Real Estate Funds (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Variable Interest Entity [Line Items]    
Carrying Amount $ 26,641.4 $ 25,814.0
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Carrying Amount 831.7  
Maximum Exposure to Loss $ 1,083.7  
Variable Interest Entity, Not Primary Beneficiary | LCS SHIP Venture I, LLC    
Variable Interest Entity [Line Items]    
Account interest 90.00%  
Carrying Amount $ 3.6  
Maximum Exposure to Loss $ 3.6  
Variable Interest Entity, Not Primary Beneficiary | Veritas - Trophy VI, LLC    
Variable Interest Entity [Line Items]    
Account interest 90.40%  
Carrying Amount $ 122.9  
Maximum Exposure to Loss $ 122.9  
Variable Interest Entity, Not Primary Beneficiary | SP V - II, LLC    
Variable Interest Entity [Line Items]    
Account interest 61.80%  
Carrying Amount $ 63.6  
Maximum Exposure to Loss $ 69.2  
Variable Interest Entity, Not Primary Beneficiary | Taconic New York City GP Fund, LP    
Variable Interest Entity [Line Items]    
Account interest 60.00%  
Carrying Amount $ 4.0  
Maximum Exposure to Loss $ 4.0  
Variable Interest Entity, Not Primary Beneficiary | Silverpeak NRE FundCo LLC    
Variable Interest Entity [Line Items]    
Account interest 90.00%  
Carrying Amount $ 99.4  
Maximum Exposure to Loss $ 134.1  
Variable Interest Entity, Not Primary Beneficiary | IDR - Core Property Index Fund, LLC    
Variable Interest Entity [Line Items]    
Account interest 0.70%  
Carrying Amount $ 34.6  
Maximum Exposure to Loss $ 34.6  
Variable Interest Entity, Not Primary Beneficiary | Townsend Group Value-Add Fund    
Variable Interest Entity [Line Items]    
Account interest 99.00%  
Carrying Amount $ 155.9  
Maximum Exposure to Loss $ 175.5  
Variable Interest Entity, Not Primary Beneficiary | Flagler REA Healthcare Properties Partnership    
Variable Interest Entity [Line Items]    
Account interest 90.00%  
Carrying Amount $ 5.7  
Maximum Exposure to Loss $ 5.7  
Variable Interest Entity, Not Primary Beneficiary | Grubb Southeast Real Estate Fund VI, LLC    
Variable Interest Entity [Line Items]    
Account interest 66.70%  
Carrying Amount $ 11.9  
Maximum Exposure to Loss $ 11.9  
Variable Interest Entity, Not Primary Beneficiary | Silverpeak NRE FundCo 2 LLC    
Variable Interest Entity [Line Items]    
Account interest 90.00%  
Carrying Amount $ 115.2  
Maximum Exposure to Loss $ 128.0  
Variable Interest Entity, Not Primary Beneficiary | JCR Capital - REA Preferred Equity Parallel Fund    
Variable Interest Entity [Line Items]    
Account interest 31.10%  
Carrying Amount $ 62.9  
Maximum Exposure to Loss $ 72.8  
Variable Interest Entity, Not Primary Beneficiary | Silverpeak NRE FundCo 3 LLC    
Variable Interest Entity [Line Items]    
Account interest 90.00%  
Carrying Amount $ 95.2  
Maximum Exposure to Loss $ 124.5  
Variable Interest Entity, Not Primary Beneficiary | Silverpeak NRE FundCo 4 LLC    
Variable Interest Entity [Line Items]    
Account interest 90.00%  
Carrying Amount $ 56.8  
Maximum Exposure to Loss $ 196.9