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Pension Benefit Obligations - Funded Status (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
United States
Reconciliation of funded status:
Funded status at end of year	$ (82.4)	$ (96.7)	$ (126.5)
Net amount recognized at end of year	(82.4)	(96.7)	(126.5)
International
Reconciliation of funded status:
Funded status at end of year	(82.9)	(107.7)	(219.0)
Net amount recognized at end of year	$ (82.9)	$ (107.7)	$ (219.0)

X

- Definition

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480535/715-20-45-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
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-Publisher FASB
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X

- Definition

Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

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- References

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