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Pension Benefit Obligations - Asset Changes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | $ 772.1 |  |
Employer contributions | 2.5 | $ 3.0 |
Fair value of plan assets at end of year | 913.3 | 772.1 |
United States |  |  |
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 98.8 | 101.4 | $ 138.9
Actual return on plan assets | 15.8 | 7.8 | (27.2)
Employer contributions | 11.9 | 8.2 | 9.8
Participant contributions | 0.1 | 0.1 | 0.1
Benefits and expenses paid | (17.6) | (17.2) | (18.4)
Plan settlements |  | (1.5) | (1.8)
Fair value of plan assets at end of year | 109.0 | 98.8 | 101.4
International |  |  |
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 673.3 | 683.5 | 1,251.8
Actual return on plan assets | 89.0 | (54.2) | (374.5)
Employer contributions | 25.1 | 24.8 | 23.6
Participant contributions | 0.3 | 0.2 | 0.3
Benefits and expenses paid | (47.7) | (42.2) | (44.3)
Plan settlements | (3.2) | (1.5) | (2.2)
Foreign currency translation (loss) gain | 67.5 | 62.7 | (171.2)
Fair value of plan assets at end of year | $ 804.3 | $ 673.3 | $ 683.5

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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 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 Reference 2: 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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