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Retirement Benefits (Benefit liability exceeds value of plan assets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
US [Member]
Pension Plans with PBO in Excess of Plan Assets:
PBO	$ 3,077.9	$ 2,605.9
Fair value of Plan assets	2,099.8	1,844.3
Pension Plans with ABO in Excess of Plan Assets:
ABO	2,738.6	2,316.5
Fair value of plan assets	2,099.8	1,844.3
International [Member]
Pension Plans with PBO in Excess of Plan Assets:
PBO	1,383.3	1,015.9
Fair value of Plan assets	1,113.2	828.9
Pension Plans with ABO in Excess of Plan Assets:
ABO	1,249.1	923.2
Fair value of plan assets	$ 1,113.2	$ 816.9

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details

- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details