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Pension Benefit Obligations - Asset Changes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | $ 1,295.8 |  |
Employer contributions to Multiemployer Pension Plans | 3.7 | $ 4.0 |
Fair value of plan assets at end of year | 1,390.7 | 1,295.8 |
United States |  |  |
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 129.6 | 129.3 | $ 131.4
Actual return on plan assets | 14.7 | 11.7 | 4.5
Employer contributions to Multiemployer Pension Plans | 13.7 | 9.1 | 12.2
Participant contributions | 0.1 |  | 0.1
Benefits and expenses paid | (18.5) | (18.4) | (17.6)
Plan settlements | (0.7) | (2.1) | (1.3)
Fair value of plan assets at end of year | 138.9 | 129.6 | 129.3
International |  |  |
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 1,166.2 | 1,068.8 | 965.9
Actual return on plan assets | 61.1 | 59.5 | 180.3
Employer contributions to Multiemployer Pension Plans | 25.2 | 27.7 | 28.2
Participant contributions | 0.3 | 0.3 | 0.3
Benefits and expenses paid | (48.6) | (42.9) | (41.3)
Plan settlements | (5.9) | (4.1) | (3.7)
Foreign currency translation gain (loss) | 53.5 | 56.9 | (60.9)
Fair value of plan assets at end of year | $ 1,251.8 | $ 1,166.2 | $ 1,068.8

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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