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Pension Plans (Details 3) (Pension Plan, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2011
Post-retirement plan
Fair values of plan assets	$ 672.3	$ 609.7
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	672.3	609.7
Cash and Cash Equivalents [Member]
Post-retirement plan
Fair values of plan assets	7.9	11.0
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	7.9	11.0
Diversified Funds [Member]
Post-retirement plan
Fair values of plan assets	159.3	108.6
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	159.3	108.6
Equity Funds [Member]
Post-retirement plan
Fair values of plan assets	220.3	192.4
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	220.3	192.4
Fixed Income Funds [Member]
Post-retirement plan
Fair values of plan assets	219.3	220.6
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	219.3	220.6
Hedge Funds [Member]
Post-retirement plan
Fair values of plan assets	27.9	25.0
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	27.9	25.0
Assets Held by Insurance Company [Member]
Post-retirement plan
Fair values of plan assets	37.6	46.1
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	37.6	46.1
Real Estate [Member]
Post-retirement plan
Fair values of plan assets		6.0
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year		6.0
Fair Value, Inputs, Level 1 [Member]
Post-retirement plan
Fair values of plan assets	3.4	11.0
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	3.4	11.0
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Post-retirement plan
Fair values of plan assets	3.4	11.0
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	3.4	11.0
Fair Value, Inputs, Level 2 [Member]
Post-retirement plan
Fair values of plan assets	655.2	586.1
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	655.2	586.1
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Post-retirement plan
Fair values of plan assets	4.5
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	4.5
Fair Value, Inputs, Level 2 [Member] | Diversified Funds [Member]
Post-retirement plan
Fair values of plan assets	159.3	108.6
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	159.3	108.6
Fair Value, Inputs, Level 2 [Member] | Equity Funds [Member]
Post-retirement plan
Fair values of plan assets	220.3	192.4
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	220.3	192.4
Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds [Member]
Post-retirement plan
Fair values of plan assets	219.3	220.6
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	219.3	220.6
Fair Value, Inputs, Level 2 [Member] | Hedge Funds [Member]
Post-retirement plan
Fair values of plan assets	14.2	12.4
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	14.2	12.4
Fair Value, Inputs, Level 2 [Member] | Assets Held by Insurance Company [Member]
Post-retirement plan
Fair values of plan assets	37.6	46.1
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year	37.6	46.1
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member]
Post-retirement plan
Fair values of plan assets		6.0
Changes in the fair value of Level 3 assets
Fair value of plan assets at end of year		6.0
Fair Value, Inputs, Level 3 [Member]
Post-retirement plan
Fair values of plan assets	13.7	12.6
Changes in the fair value of Level 3 assets
Fair value of plan assets at beginning of year	12.6	10.6
Defined Benefit Plan, Actual Return on Plan Assets Still Held	1.1	2.0
Fair value of plan assets at end of year	13.7	12.6
Fair Value, Inputs, Level 3 [Member] | Hedge Funds [Member]
Post-retirement plan
Fair values of plan assets	13.7	12.6	10.6
Changes in the fair value of Level 3 assets
Fair value of plan assets at beginning of year	12.6		10.6
Defined Benefit Plan, Actual Return on Plan Assets Still Held	1.1	2.0
Fair value of plan assets at end of year	$ 13.7	$ 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 Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(iv)(02)(A)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(iv)(02)(A)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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 Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

+ Details

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