v3.25.2
CONDENSED CONSOLIDATED SCHEDULES OF INVESTMENTS - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Fair Value $ 24,562.1 $ 24,750.1
% of Net Assets 108.30% 110.00%
Total investments at cost $ 21,741.3 $ 22,627.1
Marketable Securities    
Schedule of Investments [Line Items]    
Fair Value $ 1,155.9 $ 1,211.8
% of Net Assets 5.10% 5.40%
Total investments at cost $ 1,155.9 $ 1,211.7
Real Estate Funds    
Schedule of Investments [Line Items]    
Fair Value $ 852.2 $ 740.3
% of Net Assets 3.80% 3.30%
Total investments at cost $ 908.2 $ 798.0
Real Estate Operating Business    
Schedule of Investments [Line Items]    
Fair Value $ 1,033.1 $ 931.8
% of Net Assets 4.60% 4.10%
Total investments at cost $ 620.5 $ 491.2
Loans Receivable    
Schedule of Investments [Line Items]    
Fair Value $ 778.9 $ 780.0
% of Net Assets 3.40% 3.50%
Total investments at cost $ 1,094.2 $ 1,181.6
Loans Receivable with Related Parties    
Schedule of Investments [Line Items]    
Fair Value $ 70.2 $ 97.8
% of Net Assets 0.30% 0.40%
Total investments at cost $ 70.2 $ 97.8
Investment, Identifier [Axis]: Real Estate Joint Ventures, Arizona    
Schedule of Investments [Line Items]    
Fair Value $ 33.1 $ 27.5
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Arizona, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 33.1 $ 0.0
% of Net Assets 0.10% 0.00%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Arizona, Land    
Schedule of Investments [Line Items]    
Fair Value $ 0.0 $ 27.5
% of Net Assets 0.00% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, California    
Schedule of Investments [Line Items]    
Fair Value $ 602.7 $ 608.6
% of Net Assets 2.70% 2.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, California, Land    
Schedule of Investments [Line Items]    
Fair Value $ 60.8 $ 68.8
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Joint Ventures, California, Office    
Schedule of Investments [Line Items]    
Fair Value $ 502.3 $ 500.1
% of Net Assets 2.20% 2.20%
Investment, Identifier [Axis]: Real Estate Joint Ventures, California, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 39.6 $ 39.7
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Florida    
Schedule of Investments [Line Items]    
Fair Value $ 399.2 $ 393.3
% of Net Assets 1.80% 1.80%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Florida, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 399.2 $ 393.3
% of Net Assets 1.80% 1.80%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Foreign    
Schedule of Investments [Line Items]    
Fair Value [1] $ 119.6 $ 63.8
% of Net Assets [1] 0.50% 0.30%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Foreign, Land    
Schedule of Investments [Line Items]    
Fair Value [1] $ 119.6 $ 63.8
% of Net Assets [1] 0.50% 0.30%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Georgia    
Schedule of Investments [Line Items]    
Fair Value $ 17.8 $ 18.7
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Georgia, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 17.8 $ 0.0
% of Net Assets 0.10% 0.00%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Georgia, Land    
Schedule of Investments [Line Items]    
Fair Value $ 0.0 $ 18.7
% of Net Assets 0.00% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Maryland    
Schedule of Investments [Line Items]    
Fair Value $ 52.4 $ 51.0
% of Net Assets 0.30% 0.20%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Maryland, Land    
Schedule of Investments [Line Items]    
Fair Value $ 0.0 $ 34.0
% of Net Assets 0.00% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Maryland, Office    
Schedule of Investments [Line Items]    
Fair Value $ 35.6 $ 0.0
% of Net Assets 0.20% 0.00%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Maryland, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 16.8 $ 17.0
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Massachusetts    
Schedule of Investments [Line Items]    
Fair Value $ 159.9 $ 159.3
% of Net Assets 0.70% 0.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Massachusetts, Office    
Schedule of Investments [Line Items]    
Fair Value $ 159.9 $ 159.3
% of Net Assets 0.70% 0.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Nevada    
Schedule of Investments [Line Items]    
Fair Value $ 418.1 $ 380.8
% of Net Assets 1.80% 1.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Nevada, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 418.1 $ 380.8
% of Net Assets 1.80% 1.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, New York    
Schedule of Investments [Line Items]    
Fair Value $ 156.5 $ 148.5
% of Net Assets 0.70% 0.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, New York, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 42.8 $ 40.2
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Joint Ventures, New York, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 63.3 $ 63.1
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Joint Ventures, New York, Office    
Schedule of Investments [Line Items]    
Fair Value $ 21.6 $ 16.6
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, New York, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 28.8 $ 28.6
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, North Carolina    
Schedule of Investments [Line Items]    
Fair Value $ 288.8 $ 277.1
% of Net Assets 1.30% 1.20%
Investment, Identifier [Axis]: Real Estate Joint Ventures, North Carolina, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 168.3 $ 155.8
% of Net Assets 0.80% 0.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, North Carolina, Land    
Schedule of Investments [Line Items]    
Fair Value $ 23.5 $ 20.4
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, North Carolina, Office    
Schedule of Investments [Line Items]    
Fair Value $ 21.4 $ 30.9
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, North Carolina, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 75.6 $ 70.0
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Joint Ventures, South Carolina    
Schedule of Investments [Line Items]    
Fair Value $ 99.7 $ 88.2
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Joint Ventures, South Carolina, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 99.7 $ 69.3
% of Net Assets 0.40% 0.30%
Investment, Identifier [Axis]: Real Estate Joint Ventures, South Carolina, Land    
Schedule of Investments [Line Items]    
Fair Value $ 0.0 $ 18.9
% of Net Assets 0.00% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Tennessee    
Schedule of Investments [Line Items]    
Fair Value $ 180.1 $ 177.9
% of Net Assets 0.80% 0.80%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Tennessee, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 180.1 $ 177.9
% of Net Assets 0.80% 0.80%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Texas    
Schedule of Investments [Line Items]    
Fair Value $ 349.3 $ 347.7
% of Net Assets 1.50% 1.50%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Texas, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 50.9 $ 50.1
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Texas, Office    
Schedule of Investments [Line Items]    
Fair Value $ 298.4 $ 296.9
% of Net Assets 1.30% 1.30%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Texas, Other    
Schedule of Investments [Line Items]    
Fair Value [2] $ 0.0 $ 0.7
% of Net Assets [2] 0.00% 0.00%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Various    
Schedule of Investments [Line Items]    
Fair Value [3] $ 2,343.6 $ 2,639.0
% of Net Assets [3] 10.30% 11.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Various, Apartment    
Schedule of Investments [Line Items]    
Fair Value [3] $ 730.4 $ 1,014.7
% of Net Assets [3] 3.20% 4.50%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Various, Office    
Schedule of Investments [Line Items]    
Fair Value [3] $ 426.2 $ 427.0
% of Net Assets [3] 1.90% 1.90%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Various, Storage    
Schedule of Investments [Line Items]    
Fair Value [3] $ 1,187.0 $ 1,197.3
% of Net Assets [3] 5.20% 5.30%
Investment, Identifier [Axis]: Real Estate Properties, Alabama    
Schedule of Investments [Line Items]    
Fair Value $ 27.2 $ 27.0
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Properties, Alabama, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 27.2 $ 27.0
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Properties, Arizona    
Schedule of Investments [Line Items]    
Fair Value $ 71.1 $ 69.7
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Arizona, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 71.1 $ 69.7
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, California    
Schedule of Investments [Line Items]    
Fair Value $ 4,729.4 $ 4,821.7
% of Net Assets 20.90% 21.40%
Investment, Identifier [Axis]: Real Estate Properties, California, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 1,124.7 $ 1,173.3
% of Net Assets 5.00% 5.20%
Investment, Identifier [Axis]: Real Estate Properties, California, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 3,054.6 $ 3,177.9
% of Net Assets 13.50% 14.10%
Investment, Identifier [Axis]: Real Estate Properties, California, Office    
Schedule of Investments [Line Items]    
Fair Value $ 61.1 $ 178.2
% of Net Assets 0.30% 0.80%
Investment, Identifier [Axis]: Real Estate Properties, California, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 489.0 $ 292.3
% of Net Assets 2.10% 1.30%
Investment, Identifier [Axis]: Real Estate Properties, Colorado    
Schedule of Investments [Line Items]    
Fair Value $ 83.9 $ 83.1
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Colorado, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 43.6 $ 42.8
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Properties, Colorado, Office    
Schedule of Investments [Line Items]    
Fair Value $ 40.3 $ 40.3
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Properties, Connecticut    
Schedule of Investments [Line Items]    
Fair Value $ 24.0 $ 24.2
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Properties, Connecticut, Office    
Schedule of Investments [Line Items]    
Fair Value $ 24.0 $ 24.2
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Properties, Florida    
Schedule of Investments [Line Items]    
Fair Value $ 1,763.5 $ 1,721.7
% of Net Assets 7.80% 7.60%
Investment, Identifier [Axis]: Real Estate Properties, Florida, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 952.7 $ 928.4
% of Net Assets 4.20% 4.10%
Investment, Identifier [Axis]: Real Estate Properties, Florida, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 737.0 $ 723.5
% of Net Assets 3.30% 3.20%
Investment, Identifier [Axis]: Real Estate Properties, Florida, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 73.8 $ 69.8
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Georgia    
Schedule of Investments [Line Items]    
Fair Value $ 795.7 $ 752.3
% of Net Assets 3.50% 3.30%
Investment, Identifier [Axis]: Real Estate Properties, Georgia, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 373.5 $ 369.4
% of Net Assets 1.60% 1.60%
Investment, Identifier [Axis]: Real Estate Properties, Georgia, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 287.7 $ 250.0
% of Net Assets 1.30% 1.10%
Investment, Identifier [Axis]: Real Estate Properties, Georgia, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 134.5 $ 132.9
% of Net Assets 0.60% 0.60%
Investment, Identifier [Axis]: Real Estate Properties, Illinois    
Schedule of Investments [Line Items]    
Fair Value $ 537.5 $ 497.2
% of Net Assets 2.40% 2.20%
Investment, Identifier [Axis]: Real Estate Properties, Illinois, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 118.1 $ 116.2
% of Net Assets 0.50% 0.50%
Investment, Identifier [Axis]: Real Estate Properties, Illinois, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 270.1 $ 226.9
% of Net Assets 1.20% 1.00%
Investment, Identifier [Axis]: Real Estate Properties, Illinois, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 149.3 $ 154.1
% of Net Assets 0.70% 0.70%
Investment, Identifier [Axis]: Real Estate Properties, Indiana    
Schedule of Investments [Line Items]    
Fair Value $ 96.8 $ 95.8
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Indiana, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 96.8 $ 95.8
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Maryland    
Schedule of Investments [Line Items]    
Fair Value $ 227.4 $ 215.7
% of Net Assets 1.00% 1.00%
Investment, Identifier [Axis]: Real Estate Properties, Maryland, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 75.7 $ 73.1
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Maryland, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 86.6 $ 80.0
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Maryland, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 65.1 $ 62.6
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Massachusetts    
Schedule of Investments [Line Items]    
Fair Value $ 378.9 $ 671.3
% of Net Assets 1.60% 3.00%
Investment, Identifier [Axis]: Real Estate Properties, Massachusetts, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 53.5 $ 53.2
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Properties, Massachusetts, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 133.9 $ 132.3
% of Net Assets 0.60% 0.60%
Investment, Identifier [Axis]: Real Estate Properties, Massachusetts, Office    
Schedule of Investments [Line Items]    
Fair Value $ 93.1 $ 375.8
% of Net Assets 0.40% 1.70%
Investment, Identifier [Axis]: Real Estate Properties, Massachusetts, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 98.4 $ 110.0
% of Net Assets 0.40% 0.50%
Investment, Identifier [Axis]: Real Estate Properties, Minnesota    
Schedule of Investments [Line Items]    
Fair Value $ 133.8 $ 192.2
% of Net Assets 0.60% 0.90%
Investment, Identifier [Axis]: Real Estate Properties, Minnesota, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 0.0 $ 57.5
% of Net Assets 0.00% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Minnesota, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 133.8 $ 134.7
% of Net Assets 0.60% 0.60%
Investment, Identifier [Axis]: Real Estate Properties, Nevada    
Schedule of Investments [Line Items]    
Fair Value $ 91.3 $ 0.0
% of Net Assets 0.40% 0.00%
Investment, Identifier [Axis]: Real Estate Properties, Nevada, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 91.3 $ 0.0
% of Net Assets 0.40% 0.00%
Investment, Identifier [Axis]: Real Estate Properties, New Jersey    
Schedule of Investments [Line Items]    
Fair Value $ 464.8 $ 447.6
% of Net Assets 2.00% 2.00%
Investment, Identifier [Axis]: Real Estate Properties, New Jersey, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 380.3 $ 364.7
% of Net Assets 1.70% 1.60%
Investment, Identifier [Axis]: Real Estate Properties, New Jersey, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 84.5 $ 82.9
% of Net Assets 0.30% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, New York    
Schedule of Investments [Line Items]    
Fair Value $ 480.8 $ 509.5
% of Net Assets 2.10% 2.30%
Investment, Identifier [Axis]: Real Estate Properties, New York, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 259.5 $ 260.2
% of Net Assets 1.10% 1.20%
Investment, Identifier [Axis]: Real Estate Properties, New York, Office    
Schedule of Investments [Line Items]    
Fair Value $ 221.3 $ 249.3
% of Net Assets 1.00% 1.10%
Investment, Identifier [Axis]: Real Estate Properties, North Carolina    
Schedule of Investments [Line Items]    
Fair Value $ 176.2 $ 173.3
% of Net Assets 0.80% 0.80%
Investment, Identifier [Axis]: Real Estate Properties, North Carolina, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 78.7 $ 79.9
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, North Carolina, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 97.5 $ 93.4
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Oregon    
Schedule of Investments [Line Items]    
Fair Value $ 90.3 $ 93.4
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Oregon, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 28.2 $ 27.3
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Properties, Oregon, Office    
Schedule of Investments [Line Items]    
Fair Value $ 62.1 $ 66.1
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Pennsylvania    
Schedule of Investments [Line Items]    
Fair Value $ 62.8 $ 63.2
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Pennsylvania, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 62.8 $ 63.2
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, South Carolina    
Schedule of Investments [Line Items]    
Fair Value $ 88.2 $ 84.6
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, South Carolina, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 88.2 $ 84.6
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Tennessee    
Schedule of Investments [Line Items]    
Fair Value $ 197.0 $ 195.5
% of Net Assets 0.90% 0.90%
Investment, Identifier [Axis]: Real Estate Properties, Tennessee, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 38.6 $ 40.3
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Properties, Tennessee, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 74.4 $ 70.7
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Tennessee, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 84.0 $ 84.5
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Texas    
Schedule of Investments [Line Items]    
Fair Value $ 2,445.5 $ 2,273.8
% of Net Assets 10.80% 10.10%
Investment, Identifier [Axis]: Real Estate Properties, Texas, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 556.2 $ 608.8
% of Net Assets 2.50% 2.70%
Investment, Identifier [Axis]: Real Estate Properties, Texas, Hotel    
Schedule of Investments [Line Items]    
Fair Value $ 94.1 $ 92.7
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Texas, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 1,083.8 $ 1,052.3
% of Net Assets 4.80% 4.70%
Investment, Identifier [Axis]: Real Estate Properties, Texas, Office    
Schedule of Investments [Line Items]    
Fair Value $ 616.2 $ 520.0
% of Net Assets 2.70% 2.30%
Investment, Identifier [Axis]: Real Estate Properties, Texas, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 95.2 $ 0.0
% of Net Assets 0.40% 0.00%
Investment, Identifier [Axis]: Real Estate Properties, Utah    
Schedule of Investments [Line Items]    
Fair Value $ 50.6 $ 43.7
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Properties, Utah, Office    
Schedule of Investments [Line Items]    
Fair Value $ 50.6 $ 43.7
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Properties, Virginia    
Schedule of Investments [Line Items]    
Fair Value $ 611.8 $ 614.1
% of Net Assets 2.70% 2.70%
Investment, Identifier [Axis]: Real Estate Properties, Virginia, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 396.9 $ 387.5
% of Net Assets 1.70% 1.70%
Investment, Identifier [Axis]: Real Estate Properties, Virginia, Office    
Schedule of Investments [Line Items]    
Fair Value $ 80.5 $ 97.5
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Virginia, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 134.4 $ 129.1
% of Net Assets 0.60% 0.60%
Investment, Identifier [Axis]: Real Estate Properties, Washington    
Schedule of Investments [Line Items]    
Fair Value $ 871.8 $ 835.9
% of Net Assets 3.80% 3.70%
Investment, Identifier [Axis]: Real Estate Properties, Washington D.C.    
Schedule of Investments [Line Items]    
Fair Value $ 950.7 $ 1,100.5
% of Net Assets 4.20% 4.90%
Investment, Identifier [Axis]: Real Estate Properties, Washington D.C., Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 303.5 $ 300.0
% of Net Assets 1.30% 1.30%
Investment, Identifier [Axis]: Real Estate Properties, Washington D.C., Office    
Schedule of Investments [Line Items]    
Fair Value $ 647.2 $ 800.5
% of Net Assets 2.90% 3.60%
Investment, Identifier [Axis]: Real Estate Properties, Washington, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 275.3 $ 266.4
% of Net Assets 1.20% 1.20%
Investment, Identifier [Axis]: Real Estate Properties, Washington, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 596.5 $ 569.5
% of Net Assets 2.60% 2.50%
Investment, Identifier [Axis]: Reverse repurchase agreements    
Schedule of Investments [Line Items]    
Fair Value $ 312.3 $ 0.0
% of Net Assets 1.40% 0.00%
Investment, Identifier [Axis]: U.S. government agency notes    
Schedule of Investments [Line Items]    
Fair Value $ 741.4 $ 701.4
% of Net Assets 3.30% 3.10%
Investment, Identifier [Axis]: U.S. treasury securities    
Schedule of Investments [Line Items]    
Fair Value $ 102.2 $ 510.4
% of Net Assets 0.40% 2.30%
Real Estate Properties    
Schedule of Investments [Line Items]    
Fair Value $ 15,451.0 $ 15,607.0
% of Net Assets 68.10% 69.40%
Total investments at cost $ 12,521.6 $ 13,290.0
Real Estate Joint Ventures    
Schedule of Investments [Line Items]    
Fair Value $ 5,220.8 $ 5,381.4
% of Net Assets 23.00% 23.90%
Total investments at cost $ 5,370.7 $ 5,556.8
[1] Property is located outside of the United States.
[2] Represents residual equity value of the joint venture investment after property disposition.
[3] Properties within these investments are located throughout the United States.