Share-Based Compensation (Schedule Of Deferred Stock Unit Activity) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested as of December 31, 2012	119	119
Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding	121	122
Granted	4
Settled	(5)
Outstanding	121	122
Vested as of December 31, 2012	119
Weighted Average Grant-Date Fair Value, Outstanding as of December 31, 2011	$ 39.91
Weighted Average Grant-Date Fair Value, Granted	$ 88.49
Weighted Average Grant-Date Fair Value, Settled	$ 47.79
Weighted Average Grant-Date Fair Value, Outstanding as of December 31, 2012	$ 41.28	$ 39.91
Weighted Average Grant-Date Fair Value, Vested as of December 31, 2012	$ 40.28
Deferred Stock Units Expected To Vest [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fully vested and expected to vest as of December 31, 2012	121
Weighted Average Grant Date Fair Value, Fully vested and expected to vest as of December 31, 2012	$ 41.28

Total number of DSUs outstanding as of the end of the period.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Expected To Vest Number

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of deferred stock units that settled and converted to common stock during the reporting period.

+ References

No definition available.

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- Definition

As of the balance sheet date, the weighted-average grant date fair value of DSUs that are fully vested or expected to vest.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the weighted average grant-date fair value of DSUs outstanding.

+ References

No definition available.

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- Definition

As of the balance sheet date, the weighted average grant-date fair value of deferred stock units that have vested but remain unissued as common stock.

+ References

No definition available.

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- Definition

Total number of shares of other common stock instruments held by shareholders, such as exchangeable shares. May be all or portion of the number of common shares authorized.

+ References

No definition available.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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)(2)(iii)(1)

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

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(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.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(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.

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- Definition

Other than shares newly issued, the number of additional shares issued (for example, a stock split) or canceled (for example, to correct a share issuance), during the period under the plan.

+ 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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 65

-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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-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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