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Pension Benefit Obligations - Excess of Plan Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
United States      
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets      
Projected benefit obligation $ 184.8 $ 247.8 $ 265.1
Accumulated benefit obligation 184.8 247.8 265.1
Fair values of plan assets 101.4 138.9 129.6
Expected employer contributions in next fiscal year 8.8    
International.      
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets      
Projected benefit obligation 601.4 1,248.8 1,216.6
Accumulated benefit obligation 600.1 1,243.9 1,211.5
Fair values of plan assets 456.9 $ 982.4 $ 898.5
Expected employer contributions in next fiscal year $ 21.4