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EMPLOYEE BENEFIT PLANS - Summary of Projected Benefit Obligations, Accumulated Benefit Obligations, and Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020
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U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | $ 71.4 | $ 76.1
Accumulated benefit obligation | 71.4 | 76.1
Fair value of plan assets | 69.6 | 64.6
Non U.S. Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 106.2 | 86.8
Accumulated benefit obligation | 100.6 | 81.3
Fair value of plan assets | $ 65.1 | $ 45.5

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