v3.26.3
CONDENSED CONSOLIDATED SCHEDULES OF INVESTMENTS - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Schedule of Investments [Line Items]    
Fair Value $ 26,168.7 $ 25,405.5
% of Net Assets 110.30% 111.50%
Total investments at cost $ 22,045.6 $ 22,373.0
Marketable Securities    
Schedule of Investments [Line Items]    
Fair Value $ 1,683.0 $ 1,728.7
% of Net Assets 7.10% 7.50%
Total investments at cost $ 1,683.3 $ 1,728.6
Real Estate Funds    
Schedule of Investments [Line Items]    
Fair Value $ 831.7 $ 839.6
% of Net Assets 3.50% 3.70%
Total investments at cost $ 955.2 $ 918.3
Real Estate Operating Business    
Schedule of Investments [Line Items]    
Fair Value $ 1,842.5 $ 1,072.6
% of Net Assets 7.80% 4.70%
Total investments at cost $ 623.5 $ 621.8
Loans Receivable    
Schedule of Investments [Line Items]    
Fair Value $ 276.7 $ 620.1
% of Net Assets 1.20% 2.70%
Total investments at cost $ 553.5 $ 945.1
Loans Receivable with Related Parties    
Schedule of Investments [Line Items]    
Fair Value $ 41.8 $ 70.3
% of Net Assets 0.20% 0.30%
Total investments at cost $ 41.8 $ 70.3
Investment, Identifier [Axis]: Real Estate Joint Ventures, Arizona    
Schedule of Investments [Line Items]    
Fair Value $ 0.0 $ 31.7
% of Net Assets 0.00% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Arizona, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 0.0 $ 31.7
% of Net Assets 0.00% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, California    
Schedule of Investments [Line Items]    
Fair Value $ 744.0 $ 635.9
% of Net Assets 3.10% 2.80%
Investment, Identifier [Axis]: Real Estate Joint Ventures, California, Office    
Schedule of Investments [Line Items]    
Fair Value $ 668.9 $ 597.2
% of Net Assets 2.80% 2.60%
Investment, Identifier [Axis]: Real Estate Joint Ventures, California, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 75.1 [1] $ 38.7
% of Net Assets 0.30% 0.20%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Florida    
Schedule of Investments [Line Items]    
Fair Value $ 391.2 $ 398.6
% of Net Assets 1.60% 1.80%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Florida, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 391.2 $ 398.6
% of Net Assets 1.60% 1.80%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Foreign    
Schedule of Investments [Line Items]    
Fair Value [2] $ 170.4 $ 166.6
% of Net Assets [2] 0.70% 0.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Foreign, Land    
Schedule of Investments [Line Items]    
Fair Value [2] $ 170.4 $ 166.6
% of Net Assets [2] 0.70% 0.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Georgia    
Schedule of Investments [Line Items]    
Fair Value $ 21.1 $ 18.2
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Georgia, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 21.1 $ 18.2
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Illinois    
Schedule of Investments [Line Items]    
Fair Value $ 100.9 $ 0.0
% of Net Assets 0.40% 0.00%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Illinois, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 100.9 $ 0.0
% of Net Assets 0.40% 0.00%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Maryland    
Schedule of Investments [Line Items]    
Fair Value $ 52.5 $ 53.6
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Maryland, Office    
Schedule of Investments [Line Items]    
Fair Value $ 35.5 $ 36.5
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Maryland, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 17.0 $ 17.1
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Massachusetts    
Schedule of Investments [Line Items]    
Fair Value $ 157.9 $ 156.5
% of Net Assets 0.70% 0.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Massachusetts, Office    
Schedule of Investments [Line Items]    
Fair Value $ 157.9 $ 156.5
% of Net Assets 0.70% 0.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Nevada    
Schedule of Investments [Line Items]    
Fair Value $ 378.0 $ 414.8
% of Net Assets 1.60% 1.80%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Nevada, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 378.0 $ 414.8
% of Net Assets 1.60% 1.80%
Investment, Identifier [Axis]: Real Estate Joint Ventures, New York    
Schedule of Investments [Line Items]    
Fair Value $ 146.3 $ 161.7
% of Net Assets 0.60% 0.70%
Investment, Identifier [Axis]: Real Estate Joint Ventures, New York, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 0.0 $ 46.6
% of Net Assets 0.00% 0.20%
Investment, Identifier [Axis]: Real Estate Joint Ventures, New York, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 67.5 $ 67.3
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Joint Ventures, New York, Office    
Schedule of Investments [Line Items]    
Fair Value $ 47.5 $ 19.5
% of Net Assets 0.20% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, New York, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 31.3 $ 28.3
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, North Carolina    
Schedule of Investments [Line Items]    
Fair Value $ 72.6 $ 50.2
% of Net Assets 0.30% 0.20%
Investment, Identifier [Axis]: Real Estate Joint Ventures, North Carolina, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 0.7 [1] $ 0.0
% of Net Assets 0.00% 0.00%
Investment, Identifier [Axis]: Real Estate Joint Ventures, North Carolina, Land    
Schedule of Investments [Line Items]    
Fair Value $ 23.8 $ 23.6
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, North Carolina, Office    
Schedule of Investments [Line Items]    
Fair Value $ 47.8 $ 22.8
% of Net Assets 0.20% 0.10%
Investment, Identifier [Axis]: Real Estate Joint Ventures, North Carolina, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 0.3 [1] $ 3.8
% of Net Assets 0.00% 0.00%
Investment, Identifier [Axis]: Real Estate Joint Ventures, South Carolina    
Schedule of Investments [Line Items]    
Fair Value $ 98.8 $ 106.1
% of Net Assets 0.40% 0.50%
Investment, Identifier [Axis]: Real Estate Joint Ventures, South Carolina, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 98.8 $ 106.1
% of Net Assets 0.40% 0.50%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Tennessee    
Schedule of Investments [Line Items]    
Fair Value $ 181.5 $ 182.5
% of Net Assets 0.80% 0.80%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Tennessee, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 181.5 $ 182.5
% of Net Assets 0.80% 0.80%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Texas    
Schedule of Investments [Line Items]    
Fair Value $ 381.1 $ 355.0
% of Net Assets 1.60% 1.50%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Texas, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 55.2 $ 49.1
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Texas, Office    
Schedule of Investments [Line Items]    
Fair Value $ 325.9 $ 305.9
% of Net Assets 1.40% 1.30%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Various    
Schedule of Investments [Line Items]    
Fair Value [3] $ 2,412.2 $ 2,367.4
% of Net Assets [3] 10.20% 10.40%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Various, Apartment    
Schedule of Investments [Line Items]    
Fair Value [3] $ 644.1 [1] $ 660.0
% of Net Assets [3] 2.70% 2.90%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Various, Office    
Schedule of Investments [Line Items]    
Fair Value [3] $ 530.9 $ 500.9
% of Net Assets [3] 2.30% 2.20%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Various, Storage    
Schedule of Investments [Line Items]    
Fair Value [3] $ 1,237.2 $ 1,206.5
% of Net Assets [3] 5.20% 5.30%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Washington    
Schedule of Investments [Line Items]    
Fair Value $ 9.5 $ 0.0
% of Net Assets 0.00% 0.00%
Investment, Identifier [Axis]: Real Estate Joint Ventures, Washington, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 9.5 $ 0.0
% of Net Assets 0.00% 0.00%
Investment, Identifier [Axis]: Real Estate Properties, Alabama    
Schedule of Investments [Line Items]    
Fair Value $ 27.0 $ 25.6
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Properties, Alabama, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 27.0 $ 25.6
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Properties, Arizona    
Schedule of Investments [Line Items]    
Fair Value $ 378.1 $ 90.6
% of Net Assets 1.60% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Arizona, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 86.4 $ 0.0
% of Net Assets 0.40% 0.00%
Investment, Identifier [Axis]: Real Estate Properties, Arizona, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 291.7 $ 90.6
% of Net Assets 1.20% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, California    
Schedule of Investments [Line Items]    
Fair Value $ 4,476.5 $ 4,578.7
% of Net Assets 18.80% 20.10%
Investment, Identifier [Axis]: Real Estate Properties, California, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 951.4 $ 1,002.0
% of Net Assets 4.00% 4.40%
Investment, Identifier [Axis]: Real Estate Properties, California, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 2,960.2 $ 3,032.3
% of Net Assets 12.50% 13.30%
Investment, Identifier [Axis]: Real Estate Properties, California, Office    
Schedule of Investments [Line Items]    
Fair Value $ 59.1 $ 56.5
% of Net Assets 0.20% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, California, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 505.8 $ 487.9
% of Net Assets 2.10% 2.10%
Investment, Identifier [Axis]: Real Estate Properties, Colorado    
Schedule of Investments [Line Items]    
Fair Value $ 82.1 $ 86.4
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Colorado, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 43.7 $ 43.9
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Properties, Colorado, Office    
Schedule of Investments [Line Items]    
Fair Value $ 38.4 $ 42.5
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Properties, Connecticut    
Schedule of Investments [Line Items]    
Fair Value $ 26.8 $ 25.1
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Properties, Connecticut, Office    
Schedule of Investments [Line Items]    
Fair Value $ 26.8 $ 25.1
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Properties, Florida    
Schedule of Investments [Line Items]    
Fair Value $ 1,940.2 $ 1,868.9
% of Net Assets 8.10% 8.20%
Investment, Identifier [Axis]: Real Estate Properties, Florida, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 979.6 $ 955.4
% of Net Assets 4.10% 4.20%
Investment, Identifier [Axis]: Real Estate Properties, Florida, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 882.3 $ 837.3
% of Net Assets 3.70% 3.70%
Investment, Identifier [Axis]: Real Estate Properties, Florida, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 78.3 $ 76.2
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Georgia    
Schedule of Investments [Line Items]    
Fair Value $ 1,057.6 $ 811.7
% of Net Assets 4.50% 3.60%
Investment, Identifier [Axis]: Real Estate Properties, Georgia, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 371.4 $ 376.8
% of Net Assets 1.60% 1.70%
Investment, Identifier [Axis]: Real Estate Properties, Georgia, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 547.7 $ 299.5
% of Net Assets 2.30% 1.30%
Investment, Identifier [Axis]: Real Estate Properties, Georgia, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 138.5 $ 135.4
% of Net Assets 0.60% 0.60%
Investment, Identifier [Axis]: Real Estate Properties, Illinois    
Schedule of Investments [Line Items]    
Fair Value $ 751.7 $ 657.8
% of Net Assets 3.20% 2.90%
Investment, Identifier [Axis]: Real Estate Properties, Illinois, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 223.0 $ 201.4
% of Net Assets 0.90% 0.90%
Investment, Identifier [Axis]: Real Estate Properties, Illinois, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 417.5 $ 214.1
% of Net Assets 1.80% 0.90%
Investment, Identifier [Axis]: Real Estate Properties, Illinois, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 111.2 $ 242.3
% of Net Assets 0.50% 1.10%
Investment, Identifier [Axis]: Real Estate Properties, Indiana    
Schedule of Investments [Line Items]    
Fair Value $ 98.1 $ 98.2
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Indiana, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 98.1 $ 98.2
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Maryland    
Schedule of Investments [Line Items]    
Fair Value $ 218.1 $ 219.1
% of Net Assets 0.90% 1.00%
Investment, Identifier [Axis]: Real Estate Properties, Maryland, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 72.9 $ 76.2
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Maryland, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 94.7 $ 87.3
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Maryland, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 50.5 $ 55.6
% of Net Assets 0.20% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Massachusetts    
Schedule of Investments [Line Items]    
Fair Value $ 388.8 $ 483.2
% of Net Assets 1.60% 2.10%
Investment, Identifier [Axis]: Real Estate Properties, Massachusetts, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 166.9 $ 167.0
% of Net Assets 0.70% 0.70%
Investment, Identifier [Axis]: Real Estate Properties, Massachusetts, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 133.5 $ 137.8
% of Net Assets 0.50% 0.60%
Investment, Identifier [Axis]: Real Estate Properties, Massachusetts, Office    
Schedule of Investments [Line Items]    
Fair Value $ 0.0 $ 88.7
% of Net Assets 0.00% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Massachusetts, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 88.4 $ 89.7
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Minnesota    
Schedule of Investments [Line Items]    
Fair Value $ 221.1 $ 134.2
% of Net Assets 0.90% 0.60%
Investment, Identifier [Axis]: Real Estate Properties, Minnesota, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 221.1 $ 134.2
% of Net Assets 0.90% 0.60%
Investment, Identifier [Axis]: Real Estate Properties, Nevada    
Schedule of Investments [Line Items]    
Fair Value $ 97.6 $ 92.4
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Nevada, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 97.6 $ 92.4
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, New Jersey    
Schedule of Investments [Line Items]    
Fair Value $ 501.8 $ 488.9
% of Net Assets 2.10% 2.10%
Investment, Identifier [Axis]: Real Estate Properties, New Jersey, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 366.8 $ 373.2
% of Net Assets 1.50% 1.60%
Investment, Identifier [Axis]: Real Estate Properties, New Jersey, Land    
Schedule of Investments [Line Items]    
Fair Value $ 41.4 $ 28.7
% of Net Assets 0.20% 0.10%
Investment, Identifier [Axis]: Real Estate Properties, New Jersey, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 93.6 $ 87.0
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, New York    
Schedule of Investments [Line Items]    
Fair Value $ 542.0 $ 516.1
% of Net Assets 2.30% 2.20%
Investment, Identifier [Axis]: Real Estate Properties, New York, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 255.9 $ 256.4
% of Net Assets 1.10% 1.10%
Investment, Identifier [Axis]: Real Estate Properties, New York, Office    
Schedule of Investments [Line Items]    
Fair Value $ 286.1 $ 259.7
% of Net Assets 1.20% 1.10%
Investment, Identifier [Axis]: Real Estate Properties, North Carolina    
Schedule of Investments [Line Items]    
Fair Value $ 235.1 $ 287.4
% of Net Assets 1.00% 1.30%
Investment, Identifier [Axis]: Real Estate Properties, North Carolina, Apartments    
Schedule of Investments [Line Items]    
Fair Value $ 77.1 $ 78.2
% of Net Assets 0.30% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, North Carolina, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 108.0 $ 102.7
% of Net Assets 0.50% 0.50%
Investment, Identifier [Axis]: Real Estate Properties, North Carolina, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 50.0 $ 106.5
% of Net Assets 0.20% 0.50%
Investment, Identifier [Axis]: Real Estate Properties, Oregon    
Schedule of Investments [Line Items]    
Fair Value $ 59.5 $ 80.9
% of Net Assets 0.20% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Oregon, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 31.5 $ 29.9
% of Net Assets 0.10% 0.10%
Investment, Identifier [Axis]: Real Estate Properties, Oregon, Office    
Schedule of Investments [Line Items]    
Fair Value $ 28.0 $ 51.0
% of Net Assets 0.10% 0.20%
Investment, Identifier [Axis]: Real Estate Properties, Pennsylvania    
Schedule of Investments [Line Items]    
Fair Value $ 55.6 $ 59.4
% of Net Assets 0.20% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Pennsylvania, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 55.6 $ 59.4
% of Net Assets 0.20% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, South Carolina    
Schedule of Investments [Line Items]    
Fair Value $ 85.7 $ 87.7
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, South Carolina, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 85.7 $ 87.7
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Tennessee    
Schedule of Investments [Line Items]    
Fair Value $ 155.2 $ 205.9
% of Net Assets 0.70% 0.90%
Investment, Identifier [Axis]: Real Estate Properties, Tennessee, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 46.4 $ 43.2
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Properties, Tennessee, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 80.8 $ 77.1
% of Net Assets 0.40% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Tennessee, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 28.0 $ 85.6
% of Net Assets 0.10% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Texas    
Schedule of Investments [Line Items]    
Fair Value $ 2,426.0 $ 2,500.0
% of Net Assets 10.20% 11.00%
Investment, Identifier [Axis]: Real Estate Properties, Texas, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 551.2 $ 513.8
% of Net Assets 2.30% 2.30%
Investment, Identifier [Axis]: Real Estate Properties, Texas, Hotel    
Schedule of Investments [Line Items]    
Fair Value $ 96.0 $ 96.0
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Texas, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 1,021.4 $ 1,114.0
% of Net Assets 4.30% 4.90%
Investment, Identifier [Axis]: Real Estate Properties, Texas, Office    
Schedule of Investments [Line Items]    
Fair Value $ 652.1 $ 676.2
% of Net Assets 2.80% 3.00%
Investment, Identifier [Axis]: Real Estate Properties, Texas, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 105.3 $ 100.0
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Utah    
Schedule of Investments [Line Items]    
Fair Value $ 87.9 $ 82.2
% of Net Assets 0.40% 0.40%
Investment, Identifier [Axis]: Real Estate Properties, Utah, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 39.5 $ 36.7
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Properties, Utah, Office    
Schedule of Investments [Line Items]    
Fair Value $ 48.4 $ 45.5
% of Net Assets 0.20% 0.20%
Investment, Identifier [Axis]: Real Estate Properties, Virginia    
Schedule of Investments [Line Items]    
Fair Value $ 467.0 $ 624.0
% of Net Assets 2.00% 2.70%
Investment, Identifier [Axis]: Real Estate Properties, Virginia, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 290.5 $ 409.1
% of Net Assets 1.20% 1.80%
Investment, Identifier [Axis]: Real Estate Properties, Virginia, Office    
Schedule of Investments [Line Items]    
Fair Value $ 39.4 $ 79.4
% of Net Assets 0.20% 0.30%
Investment, Identifier [Axis]: Real Estate Properties, Virginia, Retail    
Schedule of Investments [Line Items]    
Fair Value $ 137.1 $ 135.5
% of Net Assets 0.60% 0.60%
Investment, Identifier [Axis]: Real Estate Properties, Washington    
Schedule of Investments [Line Items]    
Fair Value $ 943.9 $ 944.1
% of Net Assets 4.00% 4.20%
Investment, Identifier [Axis]: Real Estate Properties, Washington D.C.    
Schedule of Investments [Line Items]    
Fair Value $ 851.6 $ 926.9
% of Net Assets 3.60% 4.10%
Investment, Identifier [Axis]: Real Estate Properties, Washington D.C., Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 238.3 $ 286.7
% of Net Assets 1.00% 1.30%
Investment, Identifier [Axis]: Real Estate Properties, Washington D.C., Office    
Schedule of Investments [Line Items]    
Fair Value $ 613.3 $ 640.2
% of Net Assets 2.60% 2.80%
Investment, Identifier [Axis]: Real Estate Properties, Washington, Apartment    
Schedule of Investments [Line Items]    
Fair Value $ 290.6 $ 285.7
% of Net Assets 1.20% 1.30%
Investment, Identifier [Axis]: Real Estate Properties, Washington, Industrial    
Schedule of Investments [Line Items]    
Fair Value $ 653.3 $ 658.4
% of Net Assets 2.80% 2.90%
Investment, Identifier [Axis]: Reverse repurchase agreements    
Schedule of Investments [Line Items]    
Fair Value $ 569.5 $ 208.2
% of Net Assets 2.40% 0.90%
Investment, Identifier [Axis]: U.S. government agency notes    
Schedule of Investments [Line Items]    
Fair Value $ 516.9 $ 621.1
% of Net Assets 2.20% 2.70%
Investment, Identifier [Axis]: U.S. treasury securities    
Schedule of Investments [Line Items]    
Fair Value $ 596.6 $ 899.4
% of Net Assets 2.50% 3.90%
Real Estate Properties    
Schedule of Investments [Line Items]    
Fair Value $ 16,175.0 $ 15,975.4
% of Net Assets 68.10% 70.20%
Total investments at cost $ 12,994.1 $ 12,973.4
Real Estate Joint Ventures    
Schedule of Investments [Line Items]    
Fair Value $ 5,318.0 $ 5,098.8
% of Net Assets 22.40% 22.40%
Total investments at cost $ 5,194.2 $ 5,115.5
[1] Includes residual equity value of joint venture investment after property disposition.
[2] Property is located outside of the United States.
[3] Properties within these investments are located throughout the United States.