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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, 2021 | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | --- | ---
U.S. Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 81.7 | $ 81.5 | $ 81.3
U.S. Plan | Fair Value, Inputs, Level 1 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2.9 | 1.8 |
U.S. Plan | Fair value, inputs, level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2.9 | 1.8 |
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 | 78.8 | 79.7 |
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 | 3.4 | 2.9 |
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 | 16.0 | 17.5 |
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 | 59.4 | 59.3 |
International Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 221.6 | 209.9 | $ 196.6
International Plan | Fair Value, Inputs, Level 1 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 66.9 | 0.5 |
International Plan | Fair value, inputs, level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.2 | 0.5 |
International Plan | Fair value, inputs, level 3 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 66.7 | 0.0 |
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 | 154.7 | 209.4 |
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 | 48.3 | 57.3 |
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 | $ 106.4 | $ 152.1 |

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