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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Carrying value |  |
Fair value of financial assets and liabilities |  |
Mortgages payable assumed in connection with acquisitions | $ 822.0 | $ 842.3
Notes and bonds payable | 17,417.9 | 14,114.2
Fair value |  |
Fair value of financial assets and liabilities |  |
Mortgages payable assumed in connection with acquisitions | 806.1 | 810.4
Notes and bonds payable | 15,478.2 | 12,522.8
Mortgages payable |  |
Fair value of financial assets and liabilities |  |
Unamortized net premiums | 2.8 | 12.4
Deferred financing costs | 0.6 | 0.8
Notes and bonds payable |  |
Fair value of financial assets and liabilities |  |
Unamortized net premiums | 147.5 | 224.6
Deferred financing costs | 78.4 | $ 60.7
Basis adjustment on interest rate swap designated as fair value hedge | $ (4.4) |

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