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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Nov. 18, 2021 | Oct. 08, 2021
Class of Stock [Line Items] |  |  |  |
Equity Securities Registered, Value |  |  |  | $ 750.0
At-the-market Equity Offering Program, Common Stock Available for Issuance | $ 298.2 |  | $ 300.0 |
At-the-market Equity Offering Program, Common Stock Issued | 0 |  |  |
Common Stock, Shares Authorized | $ 748.2 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 24,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 23.47 |  |  |
Stock-based compensation expense | $ 0.9 | $ 0.6 |  |

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