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INCOME TAXES - Reconciliation of the Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance at beginning of year | $ 25.7 | $ 34.6 | $ 35.8
Additions for tax positions of the current year | 0.2 | 0.2 | 0.2
Additions for tax positions of prior years | 0.0 | 0.1 | 3.8
Reductions for tax positions of prior years | 0.0 | (3.7) | (0.2)
Settlements with tax authorities | 0.0 | (0.7) | (0.1)
Expiration of statutes of limitation | (3.1) | (4.8) | (4.9)
Balance at end of year | $ 22.8 | $ 25.7 | $ 34.6

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- Definition Unrecognized Tax Benefits, Increase (Decrease) Resulting from Prior Period Tax Positions + References No definition available. + Details
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- Definition Unrecognized Tax Benefits, Increase (Decrease) Resulting From Settlements With Taxing Authorities + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A + Details
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