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Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2025

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities at Fair Value

The Company’s financial assets and liabilities accounted for at fair value on a recurring basis are summarized below by level within the fair value hierarchy:

						As of September 30, 2025
(In millions)						Total						Level 1						Level 2						Level 3						NAV (a)
Cash and cash equivalents
Money market funds						$	0.8					$	0.8					$	—					$	—					$	—
Time deposits						2.6						—						2.6						—						—
Other noncurrent assets
Non-qualified trust funds						2.2						—						—						—						2.2
Deferred compensation investments						19.2						19.2						—						—						—
Total assets at fair value						$	24.8					$	20.0					$	2.6					$	—					$	2.2
Other noncurrent liabilities
Deferred compensation obligations						20.4						—						—						—						20.4
Total liabilities at fair value						$	20.4					$	—					$	—					$	—					$	20.4

						As of September 30, 2024
(In millions)						Total						Level 1						Level 2						Level 3						NAV (a)
Cash and cash equivalents
Money market funds						$	0.3					$	0.3					$	—					$	—					$	—
Time deposits						2.6						—						2.6						—						—
Other noncurrent assets
Non-qualified trust funds						1.9						—						—						—						1.9
Deferred compensation investments						23.0						23.0						—						—						—
Total assets at fair value						$	27.8					$	23.3					$	2.6					$	—					$	1.9
Other noncurrent liabilities
Deferred compensation obligations						22.3						—						—						—						22.3
Total liabilities at fair value						$	22.3					$	—					$	—					$	—					$	22.3

(a)Funds measured at fair value using the NAV per share practical expedient have not been classified in the fair value hierarchy.

Summary of Fair Value of Debt

The fair values of the Company's outstanding fixed rate senior notes shown in the table below are based on recent trading values, which are considered Level 2 inputs within the fair value hierarchy.

						September 30, 2025																		September 30, 2024
(In millions)						Fair value						Carrying value (a)						Unamortized discounts and issuance costs						Fair value						Carrying value (a)						Unamortized discounts and issuance costs
2031 Notes						$	491.0					$	531.0					$	(4.0)					$	478.5					$	530.4					$	(4.6)

(a)Carrying values shown are net of unamortized discounts and issuance costs.

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- References

No definition available.

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- Definition

Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements.

+ References

No definition available.

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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