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Summary of Significant Accounting Policies - Business Acquisition (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Apr. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 271.5 | $ 24.5 | $ 9.7 |
Scehdule of Business Information [Line Items] |  |  |  |  |
Deferred income taxes, net |  | 141.1 | 155.3 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | 271.5 | 24.5 | $ 9.7 |
Vidler Water Resources, Inc. |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 290.5 |  |  |  |
Scehdule of Business Information [Line Items] |  |  |  |  |
Business acquisition, deferred income tax valuation allowance acquired |  |  |  |  | $ 15.8
Business acquisition, cash and cash equivalents acquired |  |  |  |  | 19.0
Deferred income taxes, net |  |  |  |  | 14.8
Business acquisition, intangible and other assets acquired |  | $ 286.6 | $ 0.0 |  | 280.1
Business acquisition, total assets acquired |  |  |  |  | 313.9
Business acquisition, other liabilities acquired |  |  |  |  | 5.4
Business acquisition, total liabilities acquired |  |  |  |  | 5.4
Business acquisition, noncontrolling interest |  |  |  |  | 18.0
Business acquisition, net assets acquired |  |  |  |  | $ 290.5
Business Acquisition, Share Price |  |  |  |  | $ 15.75
Payments to Acquire Businesses, Net of Cash Acquired | $ 290.5 |  |  |  |

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