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Basis of Presentation (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2020 | Oct. 01, 2019
Entity Information [Line Items] |  |  |
Operating Lease, Right-of-Use Asset | $ 0.0 | $ 37.8 | $ 39.0
Noncontrolling Interest, Ownership Percentage by Parent |  | 65.00% |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 35.00% |
Operating Lease, Liability | 0.0 | $ 40.5 | $ 40.3
Assets Leased to Others [Member] | Single Family [Member] |  |  |
Entity Information [Line Items] |  |  |
Prior Period Reclassification Adjustment | $ 37.0 |  |

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