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RETIREMENT PLANS - Fair Value of The Company's Pension Plan Asset (Details) - Defined Benefit Pension Plan - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | --- | ---
International Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 124.8 | $ 128.9 | $ 221.6
International Plan | Fair Value, Inputs, Level 1 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 118.3 | 39.8 |
International Plan | Fair value, inputs, level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 14.0 | 1.7 |
International Plan | Fair value, inputs, level 3 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 104.3 | 38.1 |
International Plan | Total common collective trusts measured at net asset value | Common collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 6.5 | 89.1 |
International Plan | Total common collective trusts measured at net asset value | Common collective trusts | Common collective trusts—real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
International Plan | Total common collective trusts measured at net asset value | Common collective trusts | Common collective trusts—equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 32.6 |
International Plan | Total common collective trusts measured at net asset value | Common collective trusts | Common collective trusts—fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 6.5 | 56.5 |
U.S. Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 54.1 | 59.1 | $ 81.7
U.S. Plan | Fair Value, Inputs, Level 1 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2.2 | 2.1 |
U.S. Plan | Fair value, inputs, level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2.2 | 2.1 |
U.S. Plan | Fair value, inputs, level 3 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
U.S. Plan | Total common collective trusts measured at net asset value | Common collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 51.9 | 57.0 |
U.S. Plan | Total common collective trusts measured at net asset value | Common collective trusts | Common collective trusts—real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1.8 | 2.8 |
U.S. Plan | Total common collective trusts measured at net asset value | Common collective trusts | Common collective trusts—equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 10.0 | 10.0 |
U.S. Plan | Total common collective trusts measured at net asset value | Common collective trusts | Common collective trusts—fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 40.1 | $ 44.2 |

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