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Retirement Benefits (Schedule of Allocation of Plan Assets, Actual and Target Allocations) (Details) - Defined Benefit Pension Plan [Member]	Sep. 30, 2018	Sep. 30, 2017
UNITED STATES | Other Investment Asset [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	1.80%	0.20%
UNITED STATES | Other Investment Asset [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
UNITED STATES | Other Investment Asset [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
UNITED STATES | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	65.10%	64.60%
UNITED STATES | Equity Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	41.50%	41.20%
UNITED STATES | Equity Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	81.50%	81.20%
UNITED STATES | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	33.10%	35.20%
UNITED STATES | Debt Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	28.50%	28.80%
UNITED STATES | Debt Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	48.50%	48.80%
UNITED KINGDOM | Other Investment Asset [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	0.40%	0.10%
UNITED KINGDOM | Other Investment Asset [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
UNITED KINGDOM | Other Investment Asset [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
UNITED KINGDOM | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	44.80%	46.10%
UNITED KINGDOM | Equity Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	30.00%	30.00%
UNITED KINGDOM | Equity Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	60.00%	60.00%
UNITED KINGDOM | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	54.80%	53.80%
UNITED KINGDOM | Debt Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	45.00%	45.00%
UNITED KINGDOM | Debt Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	70.00%	70.00%
JAPAN | Other Investment Asset [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	0.90%	0.90%
JAPAN | Other Investment Asset [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
JAPAN | Other Investment Asset [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	2.00%	2.00%
JAPAN | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	41.00%	41.00%
JAPAN | Equity Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	36.00%	36.00%
JAPAN | Equity Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	44.00%	44.00%
JAPAN | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	58.10%	58.10%
JAPAN | Debt Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	55.00%	55.00%
JAPAN | Debt Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	63.00%	63.00%

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- Definition

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+ References

No definition available.

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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