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Notes and Contracts Payable (Schedule of Notes and Contracts Payable) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Trust deed note due November 1, 2023, interest rate of 5.26% | $ 0.0 | $ 4.0
Other notes and contracts payable with maturities through 2028, weighted-average interest rates of 3.41% and 3.30% at December 31, 2023 and 2022, respectively | 4.2 | 3.8
Debt And Capital Lease Obligations Before Discounts Premiums Debt Issuance Costs | 1,404.2 | 1,657.8
Unamortized discounts and debt issuance costs | (10.3) | (12.0)
Notes and contracts payable net of unamortized discount and debt issuance costs | 1,393.9 | 1,645.8
2.40% unsecured notes |  |
Debt Instrument [Line Items] |  |
Senior unsecured notes | 650.0 | 650.0
4.00% unsecured notes |  |
Debt Instrument [Line Items] |  |
Senior unsecured notes | 450.0 | 450.0
4.60% unsecured notes |  |
Debt Instrument [Line Items] |  |
Senior unsecured notes | 300.0 | 300.0
4.30% unsecured notes |  |
Debt Instrument [Line Items] |  |
Senior unsecured notes | $ 0.0 | $ 250.0

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