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Retirement Benefits (Benefit Liability Exceeds Value of Plan Assets) (Details) - Defined Benefit Pension Plan - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
U.S.    
Pension Plans with PBO in Excess of Plan Assets:    
PBO $ 2,289.7 $ 82.1
Fair value of plan assets 2,206.5 0.0
PBO in excess of plan assets 83.2 82.1
Pension Plans with ABO in Excess of Plan Assets:    
ABO 50.5 79.2
Fair value of plan assets 0.0 0.0
ABO in excess of plan assets 50.5 79.2
International    
Pension Plans with PBO in Excess of Plan Assets:    
PBO 284.9 456.6
Fair value of plan assets 171.8 263.4
PBO in excess of plan assets 113.1 193.2
Pension Plans with ABO in Excess of Plan Assets:    
ABO 101.3 416.8
Fair value of plan assets 20.1 263.4
ABO in excess of plan assets $ 81.2 $ 153.4