Other Assets, Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Other assets
Earnest money and refundable deposits	$ 1,079.8	$ 657.1
Insurance receivables	109.5	81.2
Other receivables	153.6	143.1
Prepaid assets	51.6	46.0
Contract assets - insurance agency commissions	58.6	47.1
Lease right of use assets	35.6	34.7
Margin deposits	0.9	16.2
Mortgage servicing rights	4.1	17.1
Mortgage hedging instruments and commitments	8.7	5.3
Other	$ 40.3	$ 34.6
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Total other assets	Total other assets
Total other assets	$ 1,560.6	$ 1,113.7
Accrued expenses and other liabilities
Reserves for legal claims	577.5	473.8	$ 434.7
Employee compensation and related liabilities	492.1	376.1
Warranty liability	376.3	310.2	$ 247.3
Customer deposits	193.4	93.1
Inventory related accruals	261.2	93.9
Federal and state income tax liabilities	88.2	42.6
Accrued property taxes	51.0	44.1
Lease liabilities	37.0	37.0
Accrued interest	31.5	35.3
Mortgage hedging instruments and commitments	1.7	16.5
Other	$ 100.4	$ 84.4
Finance Lease, Right-of-Use Asset, Accumulated Amortization	Other Liabilities	Other Liabilities
Total accrued expenses and other liabilities	$ 2,210.3	$ 1,607.0
Interest Rate Lock Commitments
Other assets
Interest rate lock commitments	$ 17.9	$ 31.3