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v3.20.2

Notes Payable - Principal Amounts (Details) - USD ($) $ in Millions | Sep. 30, 2020 | May 01, 2020 | Oct. 01, 2019 | Sep. 30, 2019
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Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Notes payable | $ 4,283.3 |  |  | $ 3,399.4
Financial Services [Member] |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Notes payable | 1,132.6 |  |  | 888.9
Forestar Consolidated [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized Debt Issuance Expense | 8.9 |  |  | 6.2
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Line of credit, amount outstanding | 0.0 |  |  | 0.0
Notes payable | 641.1 |  |  | 462.9
Home Building Consolidated |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized Debt Issuance Expense | 10.7 |  |  | 5.4
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Line of credit, amount outstanding | 0.0 |  |  | 0.0
Line of Credit, Current | 0.0 |  |  | 0.0
Notes payable | $ 2,509.6 |  |  | 2,047.6
Senior Note Member Thirty [Member] | Home Building Consolidated |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Senior notes, stated interest rate | 4.00% |  |  |
Notes payable | $ 0.0 |  |  | 499.6
Senior Note Member Thirty-One [Member] | Home Building Consolidated |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Senior notes, stated interest rate | 2.55% |  |  |
Notes payable | $ 399.8 |  |  | 398.9
Senior Note Member Twenty Five [Member] | Home Building Consolidated |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Senior notes, stated interest rate | 4.375% |  |  |
Notes payable | $ 349.2 |  |  | 348.8
Senior Note Twenty Seven [Member] | Home Building Consolidated |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Senior notes, stated interest rate | 4.75% |  |  |
Notes payable | $ 299.2 |  |  | 298.9
SeniorNoteTwentyEight [Member] | Home Building Consolidated |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Senior notes, stated interest rate | 5.75% |  |  |
Notes payable | $ 398.7 |  |  | 398.4
SeniorNoteFortyTwo [Member] | Home Building Consolidated |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Senior notes, stated interest rate | 2.50% |  | 2.50% |
Notes payable | $ 496.5 |  |  | 0.0
SeniorNoteFortyFour | Home Building Consolidated |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Senior notes, stated interest rate | 2.60% | 2.60% |  |
Notes payable | $ 495.1 |  |  | 0.0
Senior Note Member Forty [Member] | Forestar Consolidated [Member] |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Senior notes, stated interest rate | 3.75% |  |  |
Notes payable | $ 0.0 |  |  | 119.1
Senior Note Member Forty One [Member] | Forestar Consolidated [Member] |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Senior notes, stated interest rate | 8.00% |  |  |
Notes payable | $ 345.2 |  |  | 343.8
Senior Note Member Forty Three | Forestar Consolidated [Member] |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Senior notes, stated interest rate | 5.00% |  |  |
Notes payable | $ 295.9 |  |  | 0.0
Secured Debt [Member] | Home Building Consolidated |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Notes payable | 71.1 |  |  | 103.0
Segment Reconciling Items [Member] |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Notes payable | 0.0 |  |  | 2.4
Intersegment Eliminations [Member] |  |  |  |
Summary of notes payable at principal amounts, net of unamortized discounts |  |  |  |
Notes payable | $ 4.8 |  |  | $ 0.0

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