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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