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Retirement Benefits (Benefit Liability Exceeds Value of Plan Assets) (Details) - Defined Benefit Pension Plan - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
U.S.    
Pension Plans with PBO in Excess of Plan Assets:    
PBO $ 82.1 $ 3,202.2
Fair value of plan assets 0.0 2,800.3
PBO in excess of plan assets 82.1 401.9
Pension Plans with ABO in Excess of Plan Assets:    
ABO 79.2 3,081.4
Fair value of plan assets 0.0 2,800.3
ABO in excess of plan assets 79.2 281.1
International    
Pension Plans with PBO in Excess of Plan Assets:    
PBO 456.6 1,949.7
Fair value of plan assets 263.4 1,726.7
PBO in excess of plan assets 193.2 223.0
Pension Plans with ABO in Excess of Plan Assets:    
ABO 416.8 475.8
Fair value of plan assets 263.4 324.4
ABO in excess of plan assets $ 153.4 $ 151.4