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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Carrying value |  |
Fair value of financial assets and liabilities |  |
Mortgages payable | $ 198.1 | $ 822.4
Notes and bonds payable | 23,381.7 | 18,562.1
Fair value |  |
Fair value of financial assets and liabilities |  |
Mortgages payable | 196.3 | 814.5
Notes and bonds payable | $ 22,503.7 | $ 17,603.7

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