Share Options And Awards (Share Options Outstanding And Exercisable) (Details) (USD $)	9 Months Ended
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Option Outstanding, Number	4,790,828
Share Option Outstanding, Weighted Average Remaining Contractual Life (years)	5.7
Share Option Outstanding, Weighted Average Exercise Price	$ 27.84
Share Option Outstanding, Aggregate Intrinsic Value
Share Option Exercisable, Number	3,060,869
Share Option Exercisable, Weighted Average Exercise Price	$ 30.84
Share Option Exercisable, Weighted Average Remaining Contractual Life (years)	4.4
Share Option Exercisable, Aggregate Intrinsic Value
$11.85 - $17.78 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower	$ 11.85
Range of Exercise Prices, Upper	$ 17.78
Share Option Outstanding, Number	968,920
Share Option Outstanding, Weighted Average Remaining Contractual Life (years)	7.4
Share Option Outstanding, Weighted Average Exercise Price	$ 11.85
Share Option Outstanding, Aggregate Intrinsic Value
Share Option Exercisable, Number	434,519
Share Option Exercisable, Weighted Average Exercise Price	$ 11.85
Share Option Exercisable, Weighted Average Remaining Contractual Life (years)	7.4
Share Option Exercisable, Aggregate Intrinsic Value
$17.79 - $26.69 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower	$ 17.79
Range of Exercise Prices, Upper	$ 26.69
Share Option Outstanding, Number	1,448,394
Share Option Outstanding, Weighted Average Remaining Contractual Life (years)	6.3
Share Option Outstanding, Weighted Average Exercise Price	$ 23.71
Share Option Outstanding, Aggregate Intrinsic Value
Share Option Exercisable, Number	593,753
Share Option Exercisable, Weighted Average Exercise Price	$ 23.44
Share Option Exercisable, Weighted Average Remaining Contractual Life (years)	2.3
Share Option Exercisable, Aggregate Intrinsic Value
$26.70 - $40.05 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower	$ 26.70
Range of Exercise Prices, Upper	$ 40.05
Share Option Outstanding, Number	1,899,293
Share Option Outstanding, Weighted Average Remaining Contractual Life (years)	4.5
Share Option Outstanding, Weighted Average Exercise Price	$ 34.26
Share Option Outstanding, Aggregate Intrinsic Value
Share Option Exercisable, Number	1,641,172
Share Option Exercisable, Weighted Average Exercise Price	$ 34.58
Share Option Exercisable, Weighted Average Remaining Contractual Life (years)	4.2
Share Option Exercisable, Aggregate Intrinsic Value
$40.06 - $49.62 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower	$ 40.06
Range of Exercise Prices, Upper	$ 49.62
Share Option Outstanding, Number	474,221
Share Option Outstanding, Weighted Average Remaining Contractual Life (years)	5.2
Share Option Outstanding, Weighted Average Exercise Price	$ 47.46
Share Option Outstanding, Aggregate Intrinsic Value
Share Option Exercisable, Number	391,425
Share Option Exercisable, Weighted Average Exercise Price	$ 47.46
Share Option Exercisable, Weighted Average Remaining Contractual Life (years)	5.2
Share Option Exercisable, Aggregate Intrinsic Value

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet 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

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- Definition

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph d(1)

-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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-Section 50

-Paragraph 2

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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 (c)(1)(iii)

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

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- Definition

The weighted average remaining life of the exercisable stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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 (e)(2)

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

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-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 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

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

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-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 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

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

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a, 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 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

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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 (c)(1)(i)-(ii)

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

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- Definition

The weighted-average period remaining as of the balance sheet date until option expiration pertaining to the outstanding stock options for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months).

+ 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 (e)(1)

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

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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