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Capital Stock and Equity Compensation (Additional Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Nov. 09, 2021
Chief Executive Officer | Forecast |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expense that will be expensed from date of grant through retirement eligibility date |  |  |  |  | $ 4.0
Performance-Based Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock award program, measurement period (years) |  |  | 3 years |  |
Expected dividend yield (percent) |  |  | 0.00% |  |
Compensation expense | $ 1.1 | $ 1.3 | $ 3.2 | $ 2.7 |
Performance-Based Restricted Stock Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) |  |  | 0.00% |  |
Performance-Based Restricted Stock Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) |  |  | 200.00% |  |
Time-Based Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense | 1.9 | 1.5 | $ 3.7 | 3.1 |
Conversion ratio |  |  | 1 |  |
Deferred Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense | $ 1.2 | $ 1.0 | $ 1.2 | $ 1.0 |
Conversion ratio |  |  | 1 |  |
Vesting period |  |  | 13 months |  |

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