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Employee Benefit Plans - Schedule of Changes in The Benefit Obligations and Plan Assets, The Funded Status of The Plans and The Amounts Recognized in The Balance Sheet (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 601.1 | $ 542.8 |
Change in projected benefit obligation |  |  |
Benefit obligation at the beginning of the period | 546.5 | 455.8 |
Service cost | 10.1 | 9.1 | $ 10.5
Interest cost | 17.1 | 18.7 | 17.9
Actuarial loss (gain) | 44.0 | 77.4 |
Participant contributions |  | 0.1 |
Plan amendments | 9.8 | 0.2 |
Curtailments |  | 1.2 |
Benefits paid | (15.8) | (14.1) |
Currency translation adjustments | 1.9 | (1.9) |
Benefit obligation at the end of the period | 613.6 | 546.5 | 455.8
Change in plan assets |  |  |
Fair value of plan assets at the beginning of the period | 408.9 | 384.2 |
Actual return on plan assets | 35.4 | 33.9 |
Company contributions | 11.4 | 8.8 |
Participant contributions |  | 0.1 |
Expenses paid | (4.3) | (2.2) |
Benefits paid | (15.8) | (14.1) |
Currency translation adjustments | 1.7 | (1.8) |
Fair value of plan assets at the end of the period | 437.3 | 408.9 | 384.2
Funded status of plan - underfunded at September 30 | (176.3) | (137.6) |
Recognized in consolidated balance sheet at September 30 |  |  |
Accrued benefit liability (current liability) | (1.9) | (1.8) |
Accrued benefit liability (long-term liability) | (174.4) | (135.8) |
Total | (176.3) | (137.6) |
Postretirement Health and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | 53.3 | 51.4 |
Change in projected benefit obligation |  |  |
Benefit obligation at the beginning of the period | 51.4 | 46.6 |
Service cost | 3.5 | 3.1 | 3.7
Interest cost | 1.6 | 1.9 | 1.8
Actuarial loss (gain) | 5.4 | 1.4 |
Plan amendments | (6.5) |  |
Benefits paid | (2.1) | (1.6) |
Benefit obligation at the end of the period | 53.3 | 51.4 | $ 46.6
Change in plan assets |  |  |
Company contributions | 2.1 | 1.6 |
Benefits paid | (2.1) | (1.6) |
Funded status of plan - underfunded at September 30 | (53.3) | (51.4) |
Recognized in consolidated balance sheet at September 30 |  |  |
Accrued benefit liability (current liability) | (2.5) | (1.2) |
Accrued benefit liability (long-term liability) | (50.8) | (50.2) |
Total | $ (53.3) | $ (51.4) |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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