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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, 2025
Sep. 30, 2024
Sep. 30, 2023
International Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 127.0 $ 141.4 $ 124.8
International Plan | Fair Value, Inputs, Level 1 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 127.0 141.4  
International Plan | Fair value, inputs, level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 19.0 21.9  
International Plan | Fair value, inputs, level 3 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 108.0 119.5  
International Plan | Total common collective trusts measured at net asset value      
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—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 0.0  
U.S. Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 59.4 57.3 $ 54.1
U.S. Plan | Fair Value, Inputs, Level 1 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6.5 2.6  
U.S. Plan | Fair value, inputs, level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6.5 2.6  
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 52.9 54.7  
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 1.6 1.4  
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 10.1 10.9  
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 $ 41.2 $ 42.4