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Retirement Benefits (Schedule of Net Periodic Benefit Cost) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]        
Settlement charges recognized $ 4.5      
US [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost 13.0 11.3 39.0 33.8
Interest cost 29.3 31.1 87.7 93.2
Expected return on plan assets (46.4) (44.6) (139.0) (133.6)
Prior service cost amortization 0.7 0.6 2.1 1.9
Actuarial loss amortization 29.1 19.7 87.3 59.0
Settlement charges recognized 4.5 0 4.5 0
Special termination benefits 0.1 0 0.1 4.6
Other 0 0 0 0
Net periodic benefit cost 30.3 18.1 81.7 58.9
International [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost 8.0 6.0 24.3 18.1
Interest cost 14.1 15.6 43.1 46.8
Expected return on plan assets (17.6) (16.7) (53.5) (50.0)
Prior service cost amortization 0.1 0.1 0.3 0.3
Actuarial loss amortization 6.7 3.8 20.1 11.5
Settlement charges recognized 0 0 0 0
Special termination benefits 0.4 0 0.4 2.2
Other 0.5 0.6 1.6 1.9
Net periodic benefit cost 12.2 9.4 36.3 30.8
Other Postretirement Benefit Plans, Defined Benefit [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1.1 1.1 3.2 3.3
Interest cost 0.4 1.0 1.4 3.0
Expected return on plan assets 0 0 0 0
Prior service cost amortization 0 0 0 0
Actuarial loss amortization 0.6 0.7 1.8 2.1
Settlement charges recognized 0 0 0 0
Special termination benefits 0 0 0 0
Other 0 0 0 0
Net periodic benefit cost $ 2.1 $ 2.8 $ 6.4 $ 8.4