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Pension Benefit Obligations - Asset Categories (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Post-retirement plan    
Fair values of plan assets $ 913.3 $ 772.1
Cash and cash equivalents    
Post-retirement plan    
Fair values of plan assets 22.1 29.5
Debt securities    
Post-retirement plan    
Fair values of plan assets 391.5 338.3
Diversified and equity funds    
Post-retirement plan    
Fair values of plan assets 286.7 258.4
Fixed income funds    
Post-retirement plan    
Fair values of plan assets 213.9 174.3
Absolute return fund    
Post-retirement plan    
Fair values of plan assets 5.9 8.9
Derivative instruments and other    
Post-retirement plan    
Fair values of plan assets (6.8) (37.3)
Quoted Prices in Active Markets (Level 1)    
Post-retirement plan    
Fair values of plan assets 487.6 412.0
Quoted Prices in Active Markets (Level 1) | Cash and cash equivalents    
Post-retirement plan    
Fair values of plan assets 22.1 20.2
Quoted Prices in Active Markets (Level 1) | Debt securities    
Post-retirement plan    
Fair values of plan assets 391.5 338.3
Quoted Prices in Active Markets (Level 1) | Diversified and equity funds    
Post-retirement plan    
Fair values of plan assets 48.5 30.3
Quoted Prices in Active Markets (Level 1) | Fixed income funds    
Post-retirement plan    
Fair values of plan assets 17.3 21.7
Quoted Prices in Active Markets (Level 1) | Derivative instruments and other    
Post-retirement plan    
Fair values of plan assets 8.2 1.5
Significant Other Observable Inputs (Level 2)    
Post-retirement plan    
Fair values of plan assets 2.6 (11.9)
Significant Other Observable Inputs (Level 2) | Cash and cash equivalents    
Post-retirement plan    
Fair values of plan assets   9.3
Significant Other Observable Inputs (Level 2) | Diversified and equity funds    
Post-retirement plan    
Fair values of plan assets 13.5 13.2
Significant Other Observable Inputs (Level 2) | Fixed income funds    
Post-retirement plan    
Fair values of plan assets 4.1 4.4
Significant Other Observable Inputs (Level 2) | Derivative instruments and other    
Post-retirement plan    
Fair values of plan assets (15.0) (38.8)
Investments measured at NAV    
Post-retirement plan    
Fair values of plan assets 423.1 372.0
Investments measured at NAV | Diversified and equity funds    
Post-retirement plan    
Fair values of plan assets 224.7 214.9
Investments measured at NAV | Fixed income funds    
Post-retirement plan    
Fair values of plan assets 192.5 148.2
Investments measured at NAV | Absolute return fund    
Post-retirement plan    
Fair values of plan assets $ 5.9 $ 8.9