Retirement Benefits (Details 1) (USD $) In Millions	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Net amount on balance sheet consists of:
Prepaid pension	$ 4.3	$ 28.3
Retirement benefits	(1,059.3)	(923.4)
Pension Benefits [Member]
Summary of benefit obligation plan assets and funded status
Benefit obligation at beginning of year	3,179.7	2,806.9
Service cost	70.1	68.7	56.0
Interest cost	163.9	159.7	154.7
Actuarial losses (gains)	220.5	233.0
Plan amendments		30.4
Curtailment loss		0.5
Plan participant contributions	5.7	4.8
Benefits paid	(182.4)	(140.5)
Currency translation and other	25.1	16.2
Benefit obligation at end of year	3,482.6	3,179.7	2,806.9
Plan assets at beginning of year	2,486.6	2,207.8
Actual return on plan assets	50.3	213.8
Company contributions	184.7	181.2
Plan participant contributions	5.7	4.8
Currency translation and other	28.0	19.5
Plan assets at end of year	2,572.9	2,486.6	2,207.8
Funded status of plans	(909.7)	(693.1)
Net amount on balance sheet consists of:
Prepaid pension	4.3	28.3
Compensation and benefits	(9.4)	(8.8)
Retirement benefits	(904.6)	(712.6)
Net amount on balance sheet	(909.7)	(693.1)
Other Postretirement Benefits [Member]
Summary of benefit obligation plan assets and funded status
Benefit obligation at beginning of year	209.3	218.8
Service cost	3.5	3.8	3.6
Interest cost	10.2	12.5	13.3
Actuarial losses (gains)	(46.0)	(13.4)
Plan participant contributions	11.0	10.4
Benefits paid	(30.2)	(23.4)
Currency translation and other	(0.1)	0.6
Benefit obligation at end of year	157.7	209.3	218.8
Company contributions	19.2	13.0
Plan participant contributions	11.0	10.4
Funded status of plans	(157.7)	(209.3)
Net amount on balance sheet consists of:
Prepaid pension	0	0
Compensation and benefits	(16.5)	(17.9)
Retirement benefits	(141.2)	(191.4)
Net amount on balance sheet	$ (157.7)	$ (209.3)

Summary of benefit obligation plan assets and funded status.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The increase in the fair value of plan assets from contributions made by the employer.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The amount of increase or decrease in the benefit obligation attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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- Definition

The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Plan Amendment

-URI http://asc.fasb.org/extlink&oid=6520782

-Topic 715

-SubTopic 30

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-Topic 715

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 106

-Paragraph 518

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

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- Definition

For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (c)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

-URI http://asc.fasb.org/extlink&oid=6509677

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- Definition

This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 210

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-Section S99

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