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v3.20.4

Notes Payable (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Oct. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |
Letters of Credit Outstanding, Amount | $ 192.1 |  |  |  |
Notes payable | 4,225.6 |  | $ 4,283.3 |  |
Intersegment Eliminations [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable | (3.8) |  | (4.8) |  |
Home Building [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized Debt Issuance Expense | 14.1 |  | 10.7 |  |
Notes payable | 2,606.2 |  | 2,514.4 |  |
Forestar Group [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized Debt Issuance Expense | 8.4 |  | 8.9 |  |
Notes payable | 654.1 |  | 641.1 |  |
Financial Services [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | 1,350.0 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 1,575.0 |  |  |  |
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Repurchase Agreements | 1,310.0 |  |  |  |
Participating Mortgage Loans, Mortgage Obligations, Amount | 1,290.0 |  |  |  |
Advance Pay Downs on Mortgage Repurchase Facility | $ 319.4 |  |  |  |
Assets Sold under Agreements to Repurchase, Interest Rate | 2.40% |  |  |  |
Notes payable | $ 969.1 |  | 1,132.6 |  |
Financial Services [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | 1,800.0 |  |  |  |
Forestar Group [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | 380.0 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 570.0 |  |  |  |
Letters of credit, sublimit borrowing capacity, as a percentage | 50.00% |  |  |  |
Revolving credit facility | $ 0.0 |  | 0.0 |  |
Letters of Credit Outstanding, Amount | 40.5 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 339.5 |  |  |  |
Debt Repurchase Authorization Remaining | 30.0 |  |  |  |
Authorized Repurchase Of Debt Securities |  |  |  | $ 30.0 |
Letter of Credit, Maximum Borrowing Capacity (in dollars) | 100.0 |  |  |  |
Notes payable | 654.1 |  | 641.1 |  |
Home Building Consolidated |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | 1,590.0 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,500.0 |  |  |  |
Letters of credit, sublimit borrowing capacity, as a percentage | 100.00% |  |  |  |
Revolving credit facility | $ 0.0 |  | 0.0 |  |
Letters of Credit Outstanding, Amount | 151.6 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 1,440.0 |  |  |  |
Line of Credit, Current | 0.0 |  | 0.0 |  |
Debt Repurchase Authorization Remaining | 500.0 |  |  |  |
Authorized Repurchase Of Debt Securities |  |  |  |  | $ 500.0
Notes payable | 2,602.4 |  | 2,509.6 |  |
Home Building Consolidated | Short-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | 375.0 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 550.0 |  |  |  |
2.55% senior notes due 2020 [Member] | Home Building Consolidated |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturities of Senior Debt | $ 400.0 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.55% |  |  |  |
Notes payable | $ 0.0 |  | 399.8 |  |
4.375% senior notes due 2022 [Member] | Home Building Consolidated |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.375% |  |  |  |
Notes payable | $ 349.3 |  | 349.2 |  |
4.75% senior notes due 2023 [Member] | Home Building Consolidated |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% |  |  |  |
Notes payable | $ 299.3 |  | 299.2 |  |
5.75% senior notes due 2023 [Member] | Home Building Consolidated |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |  |  |
Notes payable | $ 398.8 |  | 398.7 |  |
SeniorNoteFortyTwo [Member] | Home Building Consolidated |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.50% |  |  |  |
Notes payable | $ 496.6 |  | 496.5 |  |
SeniorNoteFortyFour | Home Building Consolidated |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.60% |  |  |  |
Notes payable | $ 495.6 |  | 495.1 |  |
Senior Note Forty Five | Home Building Consolidated |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 500.0 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 1.60% |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.40% | 1.40% |  |  |
Notes payable | $ 494.1 |  | 0.0 |  |
Senior Note Member Forty One [Member] | Forestar Group [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% |  |  |  |
Notes payable | $ 345.5 |  | 345.2 |  |
Senior Note Member Forty Three | Forestar Group [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |  |  |  |
Notes payable | $ 296.1 |  | 295.9 |  |
Secured Debt [Member] | Forestar Group [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable | 12.5 |  | 0.0 |  |
Secured Debt [Member] | Home Building Consolidated |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable | $ 68.7 |  | $ 71.1 |  |

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