Corporate Indebtedness - Schedule of Junior Subordinated Deferrable Interest Debentures and Principal Maturities (Details)	1 Months Ended
	Jun. 30, 2005 USD ($) quarter	Sep. 30, 2024 USD ($)
Principal Repayments and Joint Venture Debt
Remaining 2024		$ 472,750,000
2025		530,900,000
2026		190,148,000
2027		2,335,000,000
2028		205,000,000
Thereafter		100,000,000
Total principal repayments		3,833,798,000
Trust Preferred Securities
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 100,000,000.0
Interest rate added to base rate (as a percent)	0.26%
Interest payment deferment, number of consecutive quarters | quarter	8
Joint venture
Principal Repayments and Joint Venture Debt
Remaining 2024		473,597,000
2025		1,910,561,000
2026		923,620,000
2027		1,438,338,000
2028		0
Thereafter		2,130,300,000
Total principal repayments		6,876,416,000
Joint venture | Mortgages and other loans payable
Scheduled Amortization
Remaining 2024		0
2025		0
2026		0
2027		0
2028		0
Thereafter		0
Total amortization of debt		0
Principal Repayments and Joint Venture Debt
Remaining 2024		272,750,000
2025		430,900,000
2026		190,148,000
2027		550,000,000
2028		205,000,000
Thereafter		0
Total principal repayments		1,648,798,000
Joint venture | Revolving Credit Facility
Principal Repayments and Joint Venture Debt
Remaining 2024		0
2025		0
2026		0
2027		735,000,000
2028		0
Thereafter		0
Total principal repayments		735,000,000
Joint venture | Unsecured Term Loans
Principal Repayments and Joint Venture Debt
Remaining 2024		200,000,000
2025		0
2026		0
2027		1,050,000,000
2028		0
Thereafter		0
Total principal repayments		1,250,000,000
Joint venture | Trust Preferred Securities
Principal Repayments and Joint Venture Debt
Remaining 2024		0
2025		0
2026		0
2027		0
2028		0
Thereafter		100,000,000
Total principal repayments		100,000,000
Joint venture | Senior Unsecured Notes
Principal Repayments and Joint Venture Debt
Remaining 2024		0
2025		100,000,000
2026		0
2027		0
2028		0
Thereafter		0
Total principal repayments		$ 100,000,000