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Pension Benefit Obligations - Funded Status (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
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United States |  |  |
Reconciliation of funded status: |  |  |
Funded status at end of year | $ (126.5) | $ (154.3) | $ (146.3)
Net amount recognized at end of year | (126.5) | (154.3) | (146.3)
International |  |  |
Reconciliation of funded status: |  |  |
Funded status at end of year | (219.0) | (274.1) | (242.5)
Net amount recognized at end of year | $ (219.0) | $ (274.1) | $ (242.5)

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- 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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