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v3.20.2

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Oct. 01, 2019
Business Information [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 65.00% |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 35.00% |  |  |
Cash and cash equivalents | $ 3,018.5 | $ 1,494.3 |  |
Advertising expense | 41.7 | 47.0 | $ 44.1 |
Lease right of use assets | 34.7 | 0.0 |  | $ 39.0
Lease liabilities | 37.0 | 0.0 |  | $ 40.3
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 8.9 |  |  |
Single Family [Member] | Assets Leased to Others [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Prior Period Reclassification Adjustment |  | 37.0 |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Earnest Money Deposits | 519.6 | 396.9 |  |
Subsidiaries [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Cash and cash equivalents | 51.3 | 48.6 |  |
Accounts Receivable [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Cash and cash equivalents | $ 237.6 | $ 244.8 |  |

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