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Retirement Benefits (Benefit Liability Exceeds Value of Plan Assets) (Details) - Defined Benefit Pension Plan - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
U.S.    
Pension Plans with PBO in Excess of Plan Assets:    
PBO $ 3,202.2 $ 3,069.2
Fair value of plan assets 2,800.3 2,602.8
PBO in excess of plan assets 401.9 466.4
Pension Plans with ABO in Excess of Plan Assets:    
ABO 3,081.4 2,941.2
Fair value of plan assets 2,800.3 2,602.8
ABO in excess of plan assets 281.1 338.4
International    
Pension Plans with PBO in Excess of Plan Assets:    
PBO 1,949.7 521.1
Fair value of plan assets 1,726.7 318.0
PBO in excess of plan assets 223.0 203.1
Pension Plans with ABO in Excess of Plan Assets:    
ABO 475.8 413.3
Fair value of plan assets 324.4 266.5
ABO in excess of plan assets $ 151.4 $ 146.8