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Fair Value Measurements
 9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Fair Value Measurements
12. Fair Value Measurements
The following disclosures present information about our fair value measurements using the inputs and fair value hierarchy discussed in Note 2, "Summary of Significant Accounting Policies and Recent Accounting Pronouncements."
Recurring Fair Value Measurements. The following table presents information about our financial instruments measured at fair value on a recurring basis as of September 30, 2024 and December 31, 2023.
Financial Instruments Measured at Fair Value on a Recurring Basis
 September 30, 2024December 31, 2023
(in millions)Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)TotalQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)Total
Other Assets
Deferred compensation plan investments (1)
$135.5 $— $— $135.5 $132.0 $— $— $132.0 
Derivative financial instruments (fair value hedges)$— $12.4 $— $12.4 $— $11.6 $— $11.6 
Other Liabilities
Derivative financial instruments (cash flow hedges)$— $— $— $— $— $0.7 $— $0.7 
(1)Approximately $17.7 million and $10.9 million of participant cash was withdrawn from our deferred compensation plan investments during the nine months ended September 30, 2024 and the year ended December 31, 2023, respectively.
Non-Recurring Fair Value Disclosures. During the three and nine months ended September 30, 2024, we recognized an impairment of approximately $41.0 million related to three land holdings, as further disclosed in Note 5. "Dispositions and Impairments". The fair market value of the impaired land holdings totaled approximately $46.7 million, which was determined using Level 3 inputs primarily based on broker opinions. We did not have any non-recurring fair value measurements during the year ended December 31, 2023.
Financial Instrument Fair Value Disclosures. The following table presents the carrying and estimated fair values of our notes payable at September 30, 2024 and December 31, 2023.
 September 30, 2024December 31, 2023
(in millions)Carrying
Value		Estimated
Fair Value		Carrying
Value		Estimated
Fair Value
Fixed rate notes payable$2,763.8 $2,606.9 $2,866.9 $2,651.6 
Floating rate notes payable (1)
688.0 706.9 848.5 864.9 
(1) Includes the senior unsecured notes payable due in 2026 at September 30, 2024 and December 31, 2023. At September 30, 2024, also includes balances outstanding under our unsecured revolving credit facility.