Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2022

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, 2022
(In millions)	Total		Level 1		Level 2		Level 3		NAV (a)
Cash and cash equivalents
Money market funds	$	0.4	$	0.4	$	—	$	—	$	—
Time deposits	13.3		—		13.3		—		—
Prepaid expenses and other current assets
Currency derivatives	6.0		—		6.0		—		—
Interest rate swap agreements	5.2		—		5.2		—		—
Other noncurrent assets
Non-qualified trust funds	6.4		—		—		—		6.4
Interest rate swap agreements	12.6				12.6
Total assets at fair value	$	43.9	$	0.4	$	37.1	$	—	$	6.4
Accrued expenses and other liabilities
Currency derivatives	$	5.2	$	—	$	5.2	$	—	$	—
Other noncurrent liabilities
Deferred compensation obligations	19.6		—		—		—		19.6
Total liabilities at fair value	$	24.8	$	—	$	5.2	$	—	$	19.6

	As of September 30, 2021
(In millions)	Total		Level 1		Level 2		Level 3		NAV (a)
Cash and cash equivalents
Money market funds	$	12.8	$	12.8	$	—	$	—	$	—
Time deposits	86.1		—		86.1		—		—
Prepaid expenses and other current assets
Currency derivatives	2.7		—		2.7		—		—
Other noncurrent assets
Non-qualified trust funds	11.0		—		4.0		—		7.0
Interest rate swap agreements	1.6		—		1.6		—		—
Total assets at fair value	$	114.2	$	12.8	$	94.4	$	—	$	7.0
Accrued expenses and other liabilities
Currency derivatives	$	3.3	$	—	$	3.3	$	—	$	—
Interest rate swap agreements	0.6		—		0.6		—		—
Other noncurrent liabilities
Deferred compensation obligations	22.7		—		—		—		22.7
Total liabilities at fair value	$	26.6	$	—	$	3.9	$	—	$	22.7

(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, 2022						September 30, 2021
(In millions)	Fair value		Carrying value (a)		Unamortized discounts and issuance costs		Fair value		Carrying value (a)		Unamortized discounts and issuance costs
2030 Notes	$	568.5	$	593.7	$	(6.3)	$	622.4	$	593.0	$	(7.0)
2031 Notes	400.5		529.2		(5.8)		531.3		528.6		(6.4)
Total	$	969.0	$	1,122.9	$	(12.1)	$	1,153.7	$	1,121.6	$	(13.4)

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