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Pension Benefit Obligations - Excess of Plan Assets (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
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United States |  |  |
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets |  |  |
Projected benefit obligation | $ 168.8 | $ 184.8 | $ 247.8
Accumulated benefit obligation | 168.8 | 184.8 | 247.8
Fair value of plan assets | 98.8 | 101.4 | 138.9
Expected employer contributions in next fiscal year | 12.9 |  |
International |  |  |
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets |  |  |
Projected benefit obligation | 628.1 | 601.4 | 1,248.8
Accumulated benefit obligation | 628.1 | 600.1 | 1,243.9
Fair value of plan assets | 506.5 | $ 456.9 | $ 982.4
Expected employer contributions in next fiscal year | $ 22.2 |  |

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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + 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 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-3 + Details
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