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Pension Plans (Details 3) (Pension Plans., USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Post-retirement plan
Fair values of plan assets	$ 609.7	$ 574.7
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	609.7	574.7
Cash and cash equivalents
Post-retirement plan
Fair values of plan assets	11.0	4.6
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	11.0	4.6
Diversified funds
Post-retirement plan
Fair values of plan assets	108.6	77.9
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	108.6	77.9
Equity funds
Post-retirement plan
Fair values of plan assets	192.4	181.9
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	192.4	181.9
Fixed income funds
Post-retirement plan
Fair values of plan assets	220.6	226.8
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	220.6	226.8
Hedge funds
Post-retirement plan
Fair values of plan assets	25.0	40.5
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	25.0	40.5
Assets held by insurance company
Post-retirement plan
Fair values of plan assets	46.1	37.5
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	46.1	37.5
Real estate
Post-retirement plan
Fair values of plan assets	6.0	5.5
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	6.0	5.5
Quoted Prices in Active Markets for Identical Assets (Level 1)
Post-retirement plan
Fair values of plan assets	11.0	4.6
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	11.0	4.6
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents
Post-retirement plan
Fair values of plan assets	11.0	4.6
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	11.0	4.6
Quoted Prices in Active Markets for Similar Assets (Level 2)
Post-retirement plan
Fair values of plan assets	586.1	559.5
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	586.1	559.5
Quoted Prices in Active Markets for Similar Assets (Level 2) | Diversified funds
Post-retirement plan
Fair values of plan assets	108.6	77.9
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	108.6	77.9
Quoted Prices in Active Markets for Similar Assets (Level 2) | Equity funds
Post-retirement plan
Fair values of plan assets	192.4	181.9
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	192.4	181.9
Quoted Prices in Active Markets for Similar Assets (Level 2) | Fixed income funds
Post-retirement plan
Fair values of plan assets	220.6	226.8
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	220.6	226.8
Quoted Prices in Active Markets for Similar Assets (Level 2) | Hedge funds
Post-retirement plan
Fair values of plan assets	12.4	29.9
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	12.4	29.9
Quoted Prices in Active Markets for Similar Assets (Level 2) | Assets held by insurance company
Post-retirement plan
Fair values of plan assets	46.1	37.5
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	46.1	37.5
Quoted Prices in Active Markets for Similar Assets (Level 2) | Real estate
Post-retirement plan
Fair values of plan assets	6.0	5.5
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	6.0	5.5
Significant Unobservable Inputs (Level 3)
Post-retirement plan
Fair values of plan assets	12.6	10.6
Changes in the fair value of Level 3 assets
Fair value of plan assets at beginning of year	10.6	10.0
Actual return on plan assets, relating to assets still held at reporting date	2.0	0.9
Purchases, sales and settlements		(0.3)
Fair value of plan assets at end of year	12.6	10.6
Significant Unobservable Inputs (Level 3) | Hedge funds
Post-retirement plan
Fair values of plan assets	12.6	10.6
Changes in the fair value of Level 3 assets
Fair value of plan assets at beginning of year	10.6	10.0
Actual return on plan assets, relating to assets still held at reporting date	2.0	0.9
Purchases, sales and settlements		(0.3)
Fair value of plan assets at end of year	$ 12.6	$ 10.6

X

- Definition

Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(iv)(b)(i)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: 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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- Definition

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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(iv)(b)(i)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920



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-URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 87

-Paragraph 49

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Purchases, sales, and settlements of plan assets that occurred during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(iv)(02)(B)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920



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-Publisher FASB

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-Number 132R

-Paragraph 5

-Subparagraph d(iv)(b)(ii)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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