v3.26.1
Investments in Real Estate Funds (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Variable Interest Entity [Line Items]    
Carrying Amount $ 25,778.4 $ 25,814.0
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Carrying Amount 806.2  
Maximum Exposure to Loss $ 1,093.3  
Variable Interest Entity, Not Primary Beneficiary | LCS SHIP Venture I, LLC    
Variable Interest Entity [Line Items]    
Account Interest 90.00%  
Carrying Amount $ 3.8  
Maximum Exposure to Loss $ 3.8  
Variable Interest Entity, Not Primary Beneficiary | Veritas - Trophy VI, LLC    
Variable Interest Entity [Line Items]    
Account Interest 90.40%  
Carrying Amount $ 120.0  
Maximum Exposure to Loss $ 120.0  
Variable Interest Entity, Not Primary Beneficiary | SP V - II, LLC    
Variable Interest Entity [Line Items]    
Account Interest 61.80%  
Carrying Amount $ 63.1  
Maximum Exposure to Loss $ 68.7  
Variable Interest Entity, Not Primary Beneficiary | Taconic New York City GP Fund, LP    
Variable Interest Entity [Line Items]    
Account Interest 60.00%  
Carrying Amount $ 4.2  
Maximum Exposure to Loss $ 4.2  
Variable Interest Entity, Not Primary Beneficiary | Silverpeak NRE FundCo LLC    
Variable Interest Entity [Line Items]    
Account Interest 90.00%  
Carrying Amount $ 97.4  
Maximum Exposure to Loss $ 134.5  
Variable Interest Entity, Not Primary Beneficiary | IDR - Core Property Index Fund, LLC    
Variable Interest Entity [Line Items]    
Account Interest 0.70%  
Carrying Amount $ 34.4  
Maximum Exposure to Loss $ 34.4  
Variable Interest Entity, Not Primary Beneficiary | Townsend Group Value-Add Fund    
Variable Interest Entity [Line Items]    
Account Interest 99.00%  
Carrying Amount $ 157.9  
Maximum Exposure to Loss $ 179.9  
Variable Interest Entity, Not Primary Beneficiary | Flagler REA Healthcare Properties Partnership    
Variable Interest Entity [Line Items]    
Account Interest 90.00%  
Carrying Amount $ 5.6  
Maximum Exposure to Loss $ 5.6  
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 $ 93.9  
Maximum Exposure to Loss $ 125.3  
Variable Interest Entity, Not Primary Beneficiary | JCR Capital - REA Preferred Equity Parallel Fund    
Variable Interest Entity [Line Items]    
Account Interest 31.10%  
Carrying Amount $ 79.3  
Maximum Exposure to Loss $ 89.2  
Variable Interest Entity, Not Primary Beneficiary | Silverpeak NRE FundCo 3 LLC    
Variable Interest Entity [Line Items]    
Account Interest 90.00%  
Carrying Amount $ 81.8  
Maximum Exposure to Loss $ 115.8  
Variable Interest Entity, Not Primary Beneficiary | Silverpeak NRE FundCo 4 LLC    
Variable Interest Entity [Line Items]    
Account Interest 90.00%  
Carrying Amount $ 52.9  
Maximum Exposure to Loss $ 200.0