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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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