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Retirement Benefits (Change in PBO) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
U.S. [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Obligation at beginning of year $ 3,139.9 $ 3,002.9  
Service cost 36.5 42.2 $ 42.6
Interest cost 110.7 124.7 130.7
Amendments 1.2 1.2  
Actuarial (gain) loss 380.2 130.4  
Curtailments (0.4) 5.3  
Settlement (gain) loss 5.4 6.7  
Special termination benefits 2.0 7.2  
Participant contributions 0.0 0.0  
Benefits paid (197.4) (181.8)  
Other (0.4) 1.1  
Obligation at End of Year 3,477.7 3,139.9 3,002.9
International [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Obligation at beginning of year 1,647.9 1,735.7  
Service cost 24.3 31.3 36.0
Interest cost 44.3 57.8 67.2
Amendments 0.0 (3.1)  
Actuarial (gain) loss 376.4 30.0  
Curtailments (1.2) (5.1)  
Settlement (gain) loss (3.4) (8.6)  
Special termination benefits 0.0 1.5  
Participant contributions 1.6 2.1  
Benefits paid (46.6) (50.3)  
Currency translation/other (193.7) (143.4)  
Obligation at End of Year 1,849.6 1,647.9 1,735.7
Other Postretirement Benefit Plan, Defined Benefit [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Obligation at beginning of year 86.9 93.5  
Service cost 2.2 2.8 3.3
Interest cost 2.0 2.2 2.3
Actuarial (gain) loss 7.5 (2.3)  
Benefits paid (12.3) (9.3)  
Obligation at End of Year $ 86.3 $ 86.9 $ 93.5