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EMPLOYEE BENEFIT PLANS - Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 217.0 $ 185.1
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 43.1 45.0
Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 155.1 140.1
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 18.8 0.0
Cash & cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.6 0.6
Cash & cash equivalents | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.6 0.6
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 16.4 22.6
Equity | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 8.1 11.9
Equity | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 8.3 10.7
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 39.5 28.7
Fixed Income Securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 29.6 22.3
Fixed Income Securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 9.9 6.4
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 4.8 7.2
Foreign equity | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4.8 7.2
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 23.6 26.0
Foreign fixed income securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 1.3
Foreign fixed income securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 23.6 24.7
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 42.6 42.1
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 42.6 42.1
Life insurance contracts | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Annuity policy    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 18.8 0.0
Annuity policy | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Annuity policy | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 0.0
Annuity policy | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 18.8 0.0
Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 70.7 57.9
Other | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0 1.7
Other | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 70.7 56.2
Other | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 0.0 $ 0.0