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Retirement Plans (Fair Value Asset Allocation) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 250.9 $ 261.4
Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 209.0 211.6
Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 41.9 49.8
Fixed Income Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 173.1 181.6
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 131.2 131.8
Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 41.9 49.8
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 75.7 78.0
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 75.7 78.0
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Large Cap Index Funds [Member] [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 38.0 39.1
Large Cap Index Funds [Member] [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 38.0 39.1
Large Cap Index Funds [Member] [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
International Stocks [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 37.7 38.9
International Stocks [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 37.7 38.9
International Stocks [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2.1 1.8
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2.1 1.8
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 0.0 $ 0.0