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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