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Pension Benefit Obligations - Schedule of Reconciliations of Changes In the U.S. and International Plans' Benefit Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
U.S. |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | $ 186.9 | $ 181.2 | $ 198.1
Service cost | 0.0 | 0.0 | 0.0
Participant contributions | 0.1 | 0.1 | 0.1
Interest cost | 7.9 | 9.7 | 9.8
Benefits and expenses paid | (17.1) | (17.6) | (17.2)
Actuarial loss (gain) | (0.2) | 13.5 | (8.8)
Plan settlements | (0.7) | 0.0 | (1.5)
Transfers in | 0.0 | 0.0 | 0.7
Foreign currency translation loss | 0.0 | 0.0 | 0.0
Benefit obligation at end of year | 176.9 | 186.9 | 181.2
Int’l |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 860.4 | 756.2 | 791.2
Service cost | 0.2 | 0.2 | 0.3
Participant contributions | 0.2 | 0.3 | 0.2
Interest cost | 40.1 | 43.7 | 47.7
Benefits and expenses paid | (46.2) | (47.7) | (42.2)
Actuarial loss (gain) | (69.8) | 37.0 | (112.5)
Plan settlements | 0.0 | (3.2) | (1.5)
Transfers in | 0.0 | 0.0 | 0.0
Foreign currency translation loss | 4.4 | 73.9 | 73.0
Benefit obligation at end of year | $ 789.3 | $ 860.4 | $ 756.2

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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