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v3.21.2

Notes Payable - Principal Amounts (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Oct. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Notes payable, carrying value | $ 5,412.4 |  | $ 4,283.3
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 1,900.0 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 700.3 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 13.7 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 500.4 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 900.4 |  |
Long-Term Debt, Maturity, after Year Five | 1,400.0 |  |
Intersegment Eliminations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, carrying value | (0.7) |  | (4.8)
Home Building Consolidated |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit, amount outstanding | 0.0 |  | 0.0
Line of Credit, Current | 0.0 |  | 0.0
Notes payable, carrying value | 3,213.3 |  | 2,509.6
Unamortized Debt Issuance Expense | 16.5 |  | 10.7
Home Building Consolidated | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, carrying value | $ 82.2 |  | 71.1
Home Building Consolidated | Senior Note Member Thirty-One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes, stated interest rate | 2.55% |  |
Notes payable, carrying value | $ 0.0 |  | 399.8
Home Building Consolidated | Senior Note Member Twenty Five [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes, stated interest rate | 4.375% |  |
Notes payable, carrying value | $ 349.6 |  | 349.2
Home Building Consolidated | Senior Note Twenty Seven [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes, stated interest rate | 4.75% |  |
Notes payable, carrying value | $ 299.5 |  | 299.2
Home Building Consolidated | SeniorNoteTwentyEight [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes, stated interest rate | 5.75% |  |
Notes payable, carrying value | $ 399.1 |  | 398.7
Home Building Consolidated | SeniorNoteFortyTwo [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes, stated interest rate | 2.50% | 1.40% |
Notes payable, carrying value | $ 497.3 |  | 496.5
Home Building Consolidated | SeniorNoteFortyFour |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes, stated interest rate | 2.60% |  |
Notes payable, carrying value | $ 496.2 |  | 495.1
Home Building Consolidated | SeniorNoteFortySIx |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes, stated interest rate | 1.30% |  |
Notes payable, carrying value | $ 594.5 |  | 0.0
Home Building Consolidated | Senior Note Forty Five [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes, stated interest rate | 1.40% |  |
Notes payable, carrying value | $ 494.9 |  | 0.0
Forestar Consolidated [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit, amount outstanding | 0.0 |  | 0.0
Notes payable, carrying value | 704.5 |  | 641.1
Unamortized Debt Issuance Expense | 8.0 |  | 8.9
Forestar Consolidated [Member] | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, carrying value | $ 12.5 |  | 0.0
Forestar Consolidated [Member] | Senior Note Member Forty One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes, stated interest rate | 8.00% |  |
Notes payable, carrying value | $ 0.0 |  | 345.2
Forestar Consolidated [Member] | Senior Note Forty Seven |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes, stated interest rate | 3.85% |  |
Notes payable, carrying value | $ 395.5 |  | 0.0
Forestar Consolidated [Member] | Senior Note Member Forty Three |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes, stated interest rate | 5.00% |  |
Notes payable, carrying value | $ 296.5 |  | 295.9
Financial Services [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, carrying value | $ 1,494.6 |  | $ 1,132.6

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