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Stock-Based Compensation - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 USD ($) stockAward tranche shares | Mar. 31, 2023 USD ($) stockAward shares | Jun. 30, 2023 | Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Number of types of awards granted | stockAward | 2 | 2 |  |
Fair market value of awards | $ | $ 31.1 | $ 16.8 |  |
Tax benefit from compensation expense | $ | 1.0 | $ 0.9 |  |
Unrecognized compensation expense | $ | $ 32.5 |  |  |
Unrecognized compensation, period for recognition | 2 years 2 months 12 days |  |  |
PSUs |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Granted (in shares) | 60,207 |  |  |
RSUs |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Granted (in shares) | 71,168 |  |  |
Officers and other employees | PSUs |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Granted (in shares) | 60,207 | 93,282 |  |
Performance period |  | 1 year |  |
Officers and other employees | RSUs |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Number of equal tranches for annual vesting | tranche | 3 |  |  |
Officer | PSUs |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Vesting period | 3 years |  |  |
Performance shares target percentage earned, officers |  |  |  | 2
Officer | PSUs | Minimum |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Performance shares that could be awarded as a percentage of ROIC target amount | 0 |  |  |
Officer | PSUs | Maximum |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Performance shares that could be awarded as a percentage of ROIC target amount | 2 |  |  |
Other employees | PSUs |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Performance period | 1 year |  |  |
Performance shares target percentage earned, other employees |  |  | 2 |
Number of equal tranches for annual vesting | tranche | 3 |  |  |
Other employees | PSUs | Minimum |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Performance Shares that could be awarded, as a percentage of EBITDA target amount | 0 |  |  |
Other employees | PSUs | Maximum |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Performance Shares that could be awarded, as a percentage of EBITDA target amount | 2 |  |  |
Officers and Other Employees and Nonemployment directors | RSUs |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Granted (in shares) | 71,168 | 115,060 |  |
Nonemployee Directors | RSUs |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Vesting period | 1 year |  |  |

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