Pension Benefit Plans (Summary Of Changes In Fair Value Of Level 3 Investments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Change in plan assets:
Fair value of plan assets at end of year	$ 2,555.4	$ 2,378.3
Significant Unobservable Inputs (Level 3)
Change in plan assets:
Fair value of plan assets at beginning of year	315.9	165.0
Actual return on plan assets relating to assets sold during the period	5.8	0.9
Actual return on plan assets relating to assets still held at end of period	16.5	(7.4)
Acquisitions	0	154.4
Purchases	15.5	9.3
Sales	(39.3)	(3.7)
Settlements	0	(2.6)
Fair value of plan assets at end of year	314.4	315.9
Common Stock
Change in plan assets:
Fair value of plan assets at end of year	319.9	348.6
Common Stock \| Significant Unobservable Inputs (Level 3)
Change in plan assets:
Fair value of plan assets at beginning of year		0.7
Actual return on plan assets relating to assets sold during the period		0
Actual return on plan assets relating to assets still held at end of period		0
Purchases		0
Sales		(0.7)
Fair value of plan assets at end of year		0
Venture capital and partnerships
Change in plan assets:
Fair value of plan assets at end of year	163.9	163.9
Venture capital and partnerships \| Significant Unobservable Inputs (Level 3)
Change in plan assets:
Fair value of plan assets at beginning of year	163.9	62.6
Actual return on plan assets relating to assets sold during the period	(0.3)	0
Actual return on plan assets relating to assets still held at end of period	4.7	(16.0)
Acquisitions	0	114.2
Purchases	14.8	7.0
Sales	(19.2)	(1.3)
Settlements	0	(2.6)
Fair value of plan assets at end of year	163.9	163.9
Real estate
Change in plan assets:
Fair value of plan assets at end of year	150.5	152.0
Real estate \| Significant Unobservable Inputs (Level 3)
Change in plan assets:
Fair value of plan assets at beginning of year	152.0	101.7
Actual return on plan assets relating to assets sold during the period	6.1	0.9
Actual return on plan assets relating to assets still held at end of period	11.8	8.6
Acquisitions	0	40.2
Purchases	0.7	2.3
Sales	(20.1)	(1.7)
Settlements	0
Fair value of plan assets at end of year	$ 150.5	$ 152.0

The amount of increase in the plan assets attributed to a business combination.

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The amount of decrease in the plan assets attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary.

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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.

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- Definition

The amount that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 15

-Paragraph 6

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 87

-Paragraph 264

-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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 88

-Paragraph 3

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 106

-Paragraph 518

-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 6: 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 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(8)

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

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