Derivative Financial Instruments and Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2025

Derivative Financial Instruments and Fair Value Measurements [Abstract]

Schedule of Notional Principle, Fixed Rates and Expiration Dates of Outstanding Interest Rate Swap Agreements

The notional principal, fixed rates and related effective and expiration dates of the Company’s outstanding interest rate swap agreements were as follows:

September 30, 2025

Notional Amount
Currency

Notional Amount
(in millions)

Fixed
Rate

Effective
Date

Expiration
Date

USD

400.0

1.283%

February 2023

March 2028

September 30, 2024

Notional Amount
Currency

Notional Amount
(in millions)

Fixed
Rate

Effective
Date

Expiration
Date

USD

400.0

1.283%

February 2023

March 2028

Schedule of Financial Assets and Liabilities Recorded at Fair Value on a Recurring Basis

Below are the Company’s non-pension financial assets and liabilities recorded at fair value on a recurring basis within the ASC 820-10 fair value hierarchy:


	As of September 30, 2025
	Balance Sheet Location	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value

	(in millions)
Interest rate contracts	Other current assets	$	—	$	9.0	$	—	$	9.0
Interest rate contracts	Other non-current assets	—		10.0		—		10.0
Interest rate contracts	Other current liabilities	—		(1.8)		—		(1.8)
Interest rate contracts	Other long-term liabilities	—		(2.8)		—		(2.8)
Credit facility investment	Other non-current assets	—		—		17.4		17.4
Contingent Consideration	Other long-term liabilities	—		(7.5)		—		(7.5)
Equity investment	Other non-current assets	21.9		—		—		21.9
Total net assets at fair value		$	21.9	$	6.9	$	17.4	$	46.2


	As of September 30, 2024
	Balance Sheet Location	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value

	(in millions)
Interest rate contracts	Other current assets	$	—	$	9.2	$	—	$	9.2
Interest rate contracts	Other non-current assets	—		16.5		—		16.5
Interest rate contracts	Other current liabilities	—		(0.9)		—		(0.9)
Interest rate contracts	Other long-term liabilities	—		(3.6)		—		(3.6)
Credit facility investment	Other non-current assets	—		—		21.9		21.9
Equity investment	Other non-current assets	19.4		—		—		19.4
Total net assets at fair value		$	19.4	$	21.2	$	21.9	$	62.5

Schedule of Changes in Fair Value of Level 3 Investment Assets

The table below sets forth a summary of changes in the fair value of the Company’s Level 3 investment assets:


	Year-ended September 30, 2025
	Beginning Balance		Investment Gains/(Losses)	Interest Earned	Loans	Collections	Ending Balance

	(in millions)
Credit facility investment including accrued interest	$	21.9	0.1	1.1	19.0	(24.7)	$	17.4


	Year-ended September 30, 2024
	Beginning Balance		Investment Gains/(Losses)	Interest Earned	Loans	Collections	Ending Balance
	(in millions)
Credit facility investment including accrued interest	$	—	0.5	0.5	32.5	(11.6)	$	21.9

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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