The total fair value of share units issued under the Directors' Fees Deferral Plan compensation arrangement.

No definition available.

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- Definition

The number of shares issued to directors for a specific year pursuant to the terms of the deferred compensation plan.

+ References

No definition available.

+ Details

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- Definition

The aggregate total number of shares equivalent units issued pursuant to the terms of the Directors' Fees Deferral Plan deferred compensation arrangement as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

+ Details

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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Accounting for Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended			6 Months Ended			6 Months Ended			6 Months Ended				6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Common Class A [Member]	Jun. 30, 2013 Plan 2000 [Member]	Jun. 30, 2013 Plan 2009 [Member]	Jun. 30, 2013 Directors' Fees Deferral Plan [Member]	Jun. 30, 2013 Employee Stock Option [Member]	Mar. 31, 2013 Employee Stock Option [Member]	Dec. 31, 2012 Employee Stock Option [Member]	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member]	Feb. 27, 2013 Restricted Stock Units (RSUs) [Member]	Feb. 16, 2012 Restricted Stock Units (RSUs) [Member]	Feb. 23, 2011 Restricted Stock Units (RSUs) [Member]	Jun. 30, 2013 Restricted Stock and Restricted Stock Units [Member]	Jun. 30, 2013 Restricted Stock Units, Performance-Based Units [Member]	Jun. 30, 2013 Contractual Term of Option Granted Prior to 2005 [Member] Plan 2000 [Member]	Jun. 30, 2013 Contractual Term of Option Granted From 2005 Through 2007 [Member] Plan 2000 [Member]	Jun. 30, 2013 Contractual Term Of Option Granted From 2008 or Later [Member] Plan 2000 [Member]	Jun. 30, 2013 Contractual Term of Option Granted in 2011 or Later [Member] Plan 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Contractual Term of Option Granted																		10 years	8 years	10 years	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights						one-third increments on each of the first three anniversaries of the award date	one-third increments on each of the first three anniversaries of the award date					one-third increments on each of the first three anniversaries of the award date					one-third increments on each of the first three anniversaries of the award date
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						0	4,170,996
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards	$ 47.7		$ 47.7						$ 4.1							$ 43.6
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition			24 months						12 months							25 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 10.01		$ 9.16
Share Price					$ 46.88
Aggregate intrinsic value of options exercised	9.6	0.3	28.9	0.4
Share-based Compensation, Number of Shares Received by Each Director													3,596	6,645	3,688
Share-based Payment Award, Options, Outstanding, Number									3,985,039	4,835,212	7,104,113
Cumulative Share Equivalent Units Deferred in Plan								29,448
Aggregate Fair Value Deferred in Plan								$ 1.4