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Pension Benefit Obligations - Excess of Plan Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
United States      
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets      
Projected benefit obligation $ 679.5 $ 610.4 $ 658.4
Accumulated benefit obligation 679.5 610.4 658.4
Fair values of plan assets 454.8 451.5 466.4
Expected employer contributions in next fiscal year 14.7    
International      
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets      
Projected benefit obligation 1,141.9 1,002.6 1,158.3
Accumulated benefit obligation 1,132.7 991.9 1,145.7
Fair values of plan assets 871.2 $ 760.7 $ 804.2
Expected employer contributions in next fiscal year $ 26.6