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Pension Benefit Obligations - Schedule of Components of Net Periodic Cost for Pension Plans (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service costs | $ 0.0 | $ 0.0
Interest cost on projected benefit obligation | 2.0 | 2.4
Expected return on plan assets | (1.2) | (1.4)
Amortization of net loss (gain) | 0.9 | 0.8
Net periodic benefit cost (credit) | 1.7 | 1.8
Int’l |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service costs | 0.0 | 0.1
Interest cost on projected benefit obligation | 9.9 | 10.7
Expected return on plan assets | (12.8) | (14.1)
Amortization of net loss (gain) | (0.3) | (0.6)
Net periodic benefit cost (credit) | $ (3.2) | $ (3.9)

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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