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Pension Benefit Obligations - Asset Changes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Change in plan assets
Fair value of plan assets at beginning of year	$ 1,463.5
Fair value of plan assets at end of year	1,421.4	$ 1,463.5
United States
Change in plan assets
Fair value of plan assets at beginning of year	470.4	456.9	$ 459.0
Actual return on plan assets	11.1	39.0	49.6
Employer contributions	11.6	12.3	18.5
Participant contributions	0.2	0.1	0.1
Benefits and expenses paid	(37.8)	(37.9)	(37.4)
Plan settlements			(32.9)
Fair value of plan assets at end of year	455.5	470.4	456.9
Foreign Pension Plan, Defined Benefit
Change in plan assets
Fair value of plan assets at beginning of year	993.1	973.2	925.8
Actual return on plan assets	29.3	9.6	215.9
Employer contributions	27.8	25.8	20.2
Participant contributions	0.4	0.4	0.5
Benefits and expenses paid	(53.7)	(48.3)	(41.9)
Plan settlements	(3.0)		(0.7)
Foreign currency translation gain (loss)	(28.0)	32.4	(146.6)
Fair value of plan assets at end of year	$ 965.9	$ 993.1	$ 973.2

X

- Definition

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

+ References

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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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