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Notes and Contracts Payable (Schedule of Notes and Contracts Payable) (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Other notes and contracts payable with maturities through 2029, weighted -average interest rates of 3.77% and 3.41% | $ 11.0 | $ 4.2
Debt And Capital Lease Obligations Before Discounts Premiums Debt Issuance Costs | 1,561.0 | 1,404.2
Unamortized discounts and debt issuance costs | (14.4) | (10.3)
Notes and contracts payable net of unamortized discount and debt issuance costs | 1,546.6 | 1,393.9
5.45% unsecured notes |  |
Debt Instrument [Line Items] |  |
Senior unsecured notes | 450.0 | 0.0
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 | $ 0.0 | $ 300.0

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