v3.26.1
Investments in Real Estate Funds (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Variable Interest Entity [Line Items]    
Carrying Amount $ 25,532.3 $ 25,814.0
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Carrying Amount 804.3  
Maximum Exposure to Loss $ 1,125.4  
Variable Interest Entity, Not Primary Beneficiary | LCS SHIP Venture I, LLC    
Variable Interest Entity [Line Items]    
Account Interest 90.00%  
Carrying Amount $ 2.2  
Maximum Exposure to Loss $ 2.2  
Variable Interest Entity, Not Primary Beneficiary | Veritas Trophy VI, LLC    
Variable Interest Entity [Line Items]    
Account Interest 90.40%  
Carrying Amount $ 121.6  
Maximum Exposure to Loss $ 121.6  
Variable Interest Entity, Not Primary Beneficiary | SP V - II, LLC    
Variable Interest Entity [Line Items]    
Account Interest 61.80%  
Carrying Amount $ 69.8  
Maximum Exposure to Loss $ 75.3  
Variable Interest Entity, Not Primary Beneficiary | Taconic New York City GP Fund, LP    
Variable Interest Entity [Line Items]    
Account Interest 60.00%  
Carrying Amount $ 4.4  
Maximum Exposure to Loss $ 4.4  
Variable Interest Entity, Not Primary Beneficiary | Silverpeak NRE FundCo LLC    
Variable Interest Entity [Line Items]    
Account Interest 90.00%  
Carrying Amount $ 91.7  
Maximum Exposure to Loss $ 128.8  
Variable Interest Entity, Not Primary Beneficiary | IDR - Core Property Index Fund, LLC    
Variable Interest Entity [Line Items]    
Account Interest 0.70%  
Carrying Amount $ 34.1  
Maximum Exposure to Loss $ 34.1  
Variable Interest Entity, Not Primary Beneficiary | Townsend Group Value-Add Fund    
Variable Interest Entity [Line Items]    
Account Interest 99.00%  
Carrying Amount $ 169.0  
Maximum Exposure to Loss $ 194.3  
Variable Interest Entity, Not Primary Beneficiary | Flagler REA Healthcare Properties Partnership    
Variable Interest Entity [Line Items]    
Account Interest 90.00%  
Carrying Amount $ 6.5  
Maximum Exposure to Loss $ 6.5  
Variable Interest Entity, Not Primary Beneficiary | Grubb Southeast Real Estate Fund VI, LLC    
Variable Interest Entity [Line Items]    
Account Interest 66.70%  
Carrying Amount $ 10.9  
Maximum Exposure to Loss $ 10.9  
Variable Interest Entity, Not Primary Beneficiary | Silverpeak NRE FundCo 2 LLC    
Variable Interest Entity [Line Items]    
Account Interest 90.00%  
Carrying Amount $ 89.0  
Maximum Exposure to Loss $ 124.9  
Variable Interest Entity, Not Primary Beneficiary | JCR Capital - REA Preferred Equity Parallel Fund    
Variable Interest Entity [Line Items]    
Account Interest 31.10%  
Carrying Amount $ 98.5  
Maximum Exposure to Loss $ 108.4  
Variable Interest Entity, Not Primary Beneficiary | Silverpeak NRE FundCo 3 LLC    
Variable Interest Entity [Line Items]    
Account Interest 90.00%  
Carrying Amount $ 75.7  
Maximum Exposure to Loss $ 114.0  
Variable Interest Entity, Not Primary Beneficiary | Silverpeak NRE FundCo 4 LLC    
Variable Interest Entity [Line Items]    
Account Interest 90.00%  
Carrying Amount $ 30.9  
Maximum Exposure to Loss $ 200.0