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Notes Payable - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2020 | May 01, 2020 | Feb. 01, 2020 | Oct. 01, 2019 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |
Notes payable |  | $ 4,297.3 |  |  |  | $ 3,399.4
Outstanding letters of credit |  | 159.4 |  |  |  |
Restricted Cash and Cash Equivalents |  | 19.2 |  |  |  | 19.7
Home Building [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized Debt Issuance Expense |  | 11.7 |  |  |  | 5.4
Notes payable |  | 2,490.3 |  |  |  | 2,047.6
Authorized repurchase of debt securities |  | 500.0 |  |  |  |
Restricted Cash and Cash Equivalents |  | $ 9.0 |  |  |  | 8.0
Home Building [Member] | SeniorNoteFortyTwo [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  |  | 2.50% |
Debt Instrument, Face Amount |  |  |  |  | $ 500.0 |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 2.70% |
Home Building [Member] | 4.0% senior notes due 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  | 4.00% |  |  |  |
Maturities of Senior Debt | $ 500.0 |  |  |  |  |
Home Building [Member] | SeniorNoteFortyFour |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  | 2.60% |  |  |
Debt Instrument, Face Amount |  |  | $ 500.0 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 2.80% |  |  |
Financial Services [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes payable |  | $ 1,172.9 |  |  |  | 888.9
Borrowing capacity on revolving credit facility |  | 1,350.0 |  |  |  |
Maximum borrowing capacity on revolving credit facility |  | 1,575.0 |  |  |  |
Restricted Cash and Cash Equivalents |  | 10.0 |  |  |  | 11.6
Mortgage loans held for sale pledged under repurchase agreement |  | 1,390.0 |  |  |  |
Mortgage loans held for sale pledged under repurchase agreement, collateral value |  | $ 1,360.0 |  |  |  |
Interest rate on mortgage repurchase facility |  | 2.40% |  |  |  |
Forestar Group [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized Debt Issuance Expense |  | $ 9.4 |  |  |  | 6.2
Notes payable |  | 640.6 |  |  |  | 460.5
Borrowing capacity on revolving credit facility |  | 380.0 |  |  |  |
Letter of Credit, Maximum Borrowing Capacity (in dollars) |  | 100.0 |  |  |  |
Maximum borrowing capacity on revolving credit facility |  | $ 570.0 |  |  |  |
Letters of credit, sublimit borrowing capacity, as a percentage |  | 50.00% |  |  |  |
Outstanding letters of credit |  | $ 31.6 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 348.4 |  |  |  |
Restricted Cash and Cash Equivalents |  | $ 0.0 |  |  |  | 0.0
Forestar Group [Member] | 3.75% convertible senior notes due 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  | 3.75% |  |  |  |
Maturities of Senior Debt | $ 118.9 |  |  |  |  |
Forestar Group [Member] | Senior Note Member Forty One [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  | 8.00% |  |  |  |
Debt Instrument, Face Amount |  | $ 350.0 |  |  |  |
Forestar Group [Member] | Senior Note Member Forty Three |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  | 5.00% |  |
Debt Instrument, Face Amount |  |  |  | $ 300.0 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 5.20% |  |
Forestar Group [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes payable |  | 640.6 |  |  |  | 462.9
Borrowings outstanding on revolving credit facility |  | 0.0 |  |  |  | 0.0
Forestar Group [Member] | 3.75% convertible senior notes due 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes payable |  | $ 0.0 |  |  |  | 119.1
Stated interest rate |  | 3.75% |  |  |  |
Forestar Group [Member] | Senior Note Member Forty One [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes payable |  | $ 344.8 |  |  |  | 343.8
Stated interest rate |  | 8.00% |  |  |  |
Forestar Group [Member] | Senior Note Member Forty Three |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes payable |  | $ 295.8 |  |  |  | 0.0
Stated interest rate |  | 5.00% |  |  |  |
Home Building Consolidated |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of Long-term Lines of Credit |  | $ 1,060.0 |  |  |  |
Notes payable |  | 2,483.8 |  |  |  | 2,047.6
Borrowing capacity on revolving credit facility |  | 1,590.0 |  |  |  |
Maximum borrowing capacity on revolving credit facility |  | $ 2,500.0 |  |  |  |
Letters of credit, sublimit borrowing capacity, as a percentage |  | 100.00% |  |  |  |
Proceeds from revolving credit facility |  | $ 1,060.0 |  |  |  |
Borrowings outstanding on revolving credit facility |  | 0.0 |  |  |  | 0.0
Outstanding letters of credit |  | 127.8 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 1,460.0 |  |  |  |
Home Building Consolidated | Short-term Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowing capacity on revolving credit facility |  | 375.0 |  |  |  |
Maximum borrowing capacity on revolving credit facility |  | 550.0 |  |  |  |
Proceeds from revolving credit facility |  | 0.0 |  |  |  |
Home Building Consolidated | 5.75% senior notes due 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes payable |  | $ 398.6 |  |  |  | 398.4
Stated interest rate |  | 5.75% |  |  |  |
Home Building Consolidated | SeniorNoteFortyTwo [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes payable |  | $ 496.2 |  |  |  | 0.0
Stated interest rate |  | 2.50% |  |  |  |
Home Building Consolidated | 4.0% senior notes due 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes payable |  | $ 0.0 |  |  |  | 499.6
Stated interest rate |  | 4.00% |  |  |  |
Home Building Consolidated | SeniorNoteFortyFour |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes payable |  | $ 494.8 |  |  |  | 0.0
Stated interest rate |  | 2.60% |  |  |  |
Maximum [Member] | Financial Services [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowing capacity on revolving credit facility |  | $ 1,800.0 |  |  |  |
Segment Reconciling Items [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes payable |  | 0.0 |  |  |  | 2.4
Restricted Cash and Cash Equivalents |  | $ 0.0 |  |  |  | $ 0.0

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