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Notes Payable - Financial Services Textuals (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Notes payable, carrying value	$ 5,917.7	$ 5,094.5
Financial Services [Member]
Debt Instrument [Line Items]
Notes payable, carrying value	1,533.8	1,669.6
Financial Services [Member] | Warehouse Agreement Borrowings
Debt Instrument [Line Items]
Mortgage repurchase facility, current capacity	500.0
Participating Mortgage Loans, Mortgage Obligations, Amount	310.8
Notes payable, carrying value	$ 304.5	296.3
Assets Sold under Agreements to Repurchase, Interest Rate	6.10%
Deposit Liabilities, Collateral Issued, Financial Instruments	$ 322.3
Financial Services [Member] | Commitments to Extend Credit
Debt Instrument [Line Items]
Mortgage repurchase facility, current capacity	1,600.0
Line of credit, maximum borrowing capacity	2,000.0
Participating Mortgage Loans, Mortgage Obligations, Amount	2,050.0
Notes payable, carrying value	$ 1,229.3	$ 1,373.3
Assets Sold under Agreements to Repurchase, Interest Rate	6.50%
Deposit Liabilities, Collateral Issued, Financial Instruments	$ 2,090.0

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- Definition

Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

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