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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Equity Securities Registered, Value |  |  |  |  |  | $ 500.0
Common Stock Available for Issuance, Value Remaining | $ 370.6 |  | $ 370.6 |  |  |
Stock-based compensation expense | 0.9 | $ 0.8 | 1.2 | $ 1.3 |  |
At-the-market Equity Offering Program, Common Stock Available for Issuance | $ 76.3 |  | $ 76.3 |  | $ 100.0 |
At-the-market Equity Offering Program, Common Stock Issued | 1,000,000.0 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 232,320 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 23.12 |  |  |
Stock Issued During Period, Value, New Issues | $ 23.3 |  |  |  |  |
Retirement Eligible [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 0.7 | $ 0.5 |  |
Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
At-the-market Equity Offering Program, Common Stock Issued | 1,018,503 |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 1.0 |  |  |  |  |

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