Other Assets, Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021
Other assets
Earnest money and refundable deposits	$ 1,684.5		$ 1,685.7
Mortgage hedging instruments and commitments	10.6		330.2
Other receivables	143.3		210.9
Insurance receivables	139.0		137.9	$ 112.0
Prepaid assets	83.1		77.4
Contract assets - insurance agency commissions	77.3		74.3
Lease right of use assets	43.4		46.6
Mortgage servicing rights	4.6		10.6
Other	51.2		52.4
Other assets	2,615.1		2,960.3
Accrued expenses and other liabilities
Reserves for legal claims	768.3		729.1	617.1		$ 577.5
Employee compensation and related liabilities	465.4		524.3
Warranty liability	474.7	$ 464.0	454.3	$ 407.8	$ 390.0	$ 376.3
Inventory related accruals	349.4		403.6
Broker deposits related to hedging instruments	6.6		240.9
Customer deposits	171.6		224.2
Federal and state income tax liabilities	330.0		110.9
Accrued property taxes	34.9		60.1
Lease liabilities	44.7		47.9
Accrued interest	32.0		33.8
Mortgage hedging instruments and commitments	22.7		12.4
Other	129.0		113.3
Accrued expenses and other liabilities	2,830.8		3,138.3
Vidler Water Resources, Inc.
Other assets
Water rights and other water-related assets	319.3		286.6
Interest rate lock commitments [Member]
Other assets
Interest rate lock commitments	58.8		47.7
Accrued expenses and other liabilities
Interest rate lock commitments	$ 1.5		$ 183.5