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RETIREMENT PLANS - Benefit Obligations, Plan Assets, Annual Expense, Assumptions and Other Information of the Company's Defined Benefit Pension Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Amounts recognized in the Consolidated Balance Sheets consist of: |  |
Noncurrent assets | $ 89.9 | $ 64.3
Noncurrent liabilities | (98.2) | (96.2)
U.S. Plan | Defined Benefit Pension Plan |  |
Change in projected benefit obligation: |  |
Benefit obligation at beginning of year | 109.8 | 108.0
Interest cost | 1.5 | 2.6
Actuarial (gain) loss | (4.1) | 6.4
Benefits paid | (7.0) | (7.2)
Projected benefit obligation (“PBO”) at end of year | 100.2 | 109.8
Accumulated benefit obligation (“ABO”) at end of year | 100.2 | 109.8
Change in plan assets: |  |
Fair value of plan assets at beginning of year | 81.5 | 81.3
Actual return on plan assets | 5.9 | 5.1
Employer contribution | 1.3 | 2.3
Benefits paid | (7.0) | (7.2)
Fair value of plan assets at end of year | 81.7 | 81.5
Unfunded status at end of year | (18.5) | (28.3)
Information for pension plans with an ABO in excess of plan assets: |  |
Accumulated benefit obligation | 100.2 | 109.8
Fair value of plan assets | 81.7 | 81.5
Projected benefit obligation | 100.2 | 109.8
Amounts recognized in the Consolidated Balance Sheets consist of: |  |
Noncurrent assets | 0.0 | 0.0
Current liabilities | (0.2) | (0.2)
Noncurrent liabilities | (18.3) | (28.1)
Total amount accrued | (18.5) | (28.3)
Amounts recognized in AOCL consist of: |  |
Actuarial loss | 39.2 | 47.9
Total amount recognized | 39.2 | 47.9
Total change in other comprehensive loss attributable to: |  |
Net gain (loss) during the period | 6.6 | (5.3)
Reclassification to net income | 2.1 | 1.8
Foreign currency translation | 0.0 | 0.0
Total change in other comprehensive loss | $ 8.7 | $ (3.5)
Weighted average assumptions used in development of projected benefit obligation: |  |
Discount rate | 2.37% | 2.05%
International Plan | Defined Benefit Pension Plan |  |
Change in projected benefit obligation: |  |
Benefit obligation at beginning of year | $ 193.7 | $ 185.2
Interest cost | 2.6 | 2.7
Actuarial (gain) loss | (2.9) | 4.0
Benefits paid | (7.6) | (7.7)
Foreign currency translation | 7.8 | 9.5
Projected benefit obligation (“PBO”) at end of year | 193.6 | 193.7
Accumulated benefit obligation (“ABO”) at end of year | 193.6 | 193.7
Change in plan assets: |  |
Fair value of plan assets at beginning of year | 209.9 | 196.6
Actual return on plan assets | 2.1 | 3.9
Employer contribution | 7.9 | 7.3
Benefits paid | (7.6) | (7.7)
Foreign currency translation | 9.3 | 9.8
Fair value of plan assets at end of year | 221.6 | 209.9
Unfunded status at end of year | 28.0 | 16.2
Information for pension plans with an ABO in excess of plan assets: |  |
Accumulated benefit obligation | 16.9 | 18.3
Fair value of plan assets | 0.0 | 0.0
Projected benefit obligation | 16.9 | 18.3
Amounts recognized in the Consolidated Balance Sheets consist of: |  |
Noncurrent assets | 44.9 | 34.5
Current liabilities | (0.9) | (0.9)
Noncurrent liabilities | (16.0) | (17.4)
Total amount accrued | 28.0 | 16.2
Amounts recognized in AOCL consist of: |  |
Actuarial loss | 51.4 | 50.2
Prior service cost | 2.7 | 2.6
Total amount recognized | 54.1 | 52.8
Total change in other comprehensive loss attributable to: |  |
Net gain (loss) during the period | (0.6) | (7.0)
Reclassification to net income | 1.3 | 1.0
Foreign currency translation | (2.0) | (2.5)
Total change in other comprehensive loss | $ (1.3) | $ (8.5)
Weighted average assumptions used in development of projected benefit obligation: |  |
Discount rate | 1.90% | 1.51%

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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. 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 (b)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 4: 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=123450688&loc=d3e4179-114921 + Details
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