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Notes Payable - Homebuilding Textuals (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2021	Aug. 01, 2021	Oct. 31, 2020	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Letters of credit, amount outstanding	$ 247.4		$ 247.4
Percentage of Company Assets Owned by Entities that Guarantee Homebuilding Senior Notes and Revolving Credit Facility	80.00%		80.00%
Home Building Consolidated
Debt Instrument [Line Items]
Mortgage repurchase facility, current capacity	$ 2,190.0		$ 2,190.0
Line of credit, maximum borrowing capacity	$ 3,000.0		$ 3,000.0
Letter of Credit, Maximum Borrowing Capacity	100.00%		100.00%
Line of credit, amount outstanding	$ 0.0		$ 0.0			$ 0.0
Letters of credit, amount outstanding	187.1		187.1
Line of Credit Facility, Remaining Borrowing Capacity	2,000.0		2,000.0
Authorized Repurchase Of Debt Securities							$ 500.0
Debt Repurchase Authorization Remaining	500.0		500.0
Home Building Consolidated | SeniorNoteFortyTwo [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500.0		$ 500.0		$ 500.0
Senior notes, stated interest rate	2.50%		2.50%		1.40%
Debt Instrument, Maturity Date		Oct. 15, 2027	Oct. 15, 2024
Debt Instrument, Interest Rate, Effective Percentage	2.70%		2.70%		1.60%
Home Building Consolidated | Senior Note Thirty [Member]
Debt Instrument [Line Items]
Senior notes, stated interest rate	2.55%		2.55%
Maturities of Senior Debt		$ 400.0
Home Building Consolidated | Senior Note Forty Six
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 600.0
Senior notes, stated interest rate				1.30%
Debt Instrument, Maturity Date	Oct. 15, 2026
Debt Instrument, Interest Rate, Effective Percentage				1.50%
Home Building Consolidated | Senior Notes Subject to Repurchase Upon Change of Control and Ratings Downgrade [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			101.00%

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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