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v3.21.2

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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