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EMPLOYEE BENEFIT PLANS - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 161.5 $ 162.6
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 45.1 41.1
Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 116.4 121.5
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Cash & cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6.3 1.3
Cash & cash equivalents | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6.3 1.3
Cash & cash equivalents | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Cash & cash equivalents | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Equity    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 7.6 7.9
Equity | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4.2 3.5
Equity | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3.4 4.4
Equity | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 38.4 40.4
Fixed income securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 31.8 33.3
Fixed income securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6.6 7.1
Fixed income securities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Foreign equity    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2.8 3.0
Foreign equity | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2.8 3.0
Foreign equity | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Foreign equity | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Foreign fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 51.3 60.5
Foreign fixed income securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Foreign fixed income securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 51.3 60.5
Foreign fixed income securities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Life insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 51.5 47.0
Life insurance contracts | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Life insurance contracts | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 51.5 47.0
Life insurance contracts | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3.6 2.5
Other | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Other | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3.6 2.5
Other | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 0.0 $ 0.0