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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, 2024
Sep. 30, 2023
Sep. 30, 2022
International Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 141.4 $ 124.8 $ 128.9
International Plan | Fair Value, Inputs, Level 1 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 141.4 118.3  
International Plan | Fair value, inputs, level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21.9 14.0  
International Plan | Fair value, inputs, level 3 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 119.5 104.3  
International Plan | Total common collective trusts measured at net asset value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 6.5  
International Plan | Total common collective trusts measured at net asset value | 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—equities      
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—fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 6.5  
U.S. Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 57.3 54.1 $ 59.1
U.S. Plan | Fair Value, Inputs, Level 1 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2.6 2.2  
U.S. Plan | Fair value, inputs, level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2.6 2.2  
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      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 54.7 51.9  
U.S. Plan | Total common collective trusts measured at net asset value | Common collective trusts—real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.4 1.8  
U.S. Plan | Total common collective trusts measured at net asset value | Common collective trusts—equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10.9 10.0  
U.S. Plan | Total common collective trusts measured at net asset value | Common collective trusts—fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 42.4 $ 40.1