Share-Based Compensation (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Jan. 31, 2012
Correcting Adjustment To Allocated Share Based Compensation	$ 13.5
Correcting Adjustment to Allocated Share Based Compensation Expense Net Of Ta	$ 8.3
Number Of Shares To Companys Maximum Award Level For Eligible Employees (in millions)	0.6
Percentage Of Awards Applied To Performance Condition	50.00%
Percentage of Awards Applied to Market Condition	50.00%
Stock Price Fixed For Performance Share Awar Compensation Expense		$ 34.94
Stock options and Restricted Stock Units (RSUs) [Member]
Vesting period, in years	3
Stock Appreciation Rights (SARs) [Member]
Vesting period, in years	10

Correcting adjustment to expense recognized during the period arising from equity-based compensation arrantments

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- Definition

Correcting adjustment to expense recognized during the period arising from equity-based compensation awards, net of tax

+ References

No definition available.

+ Details

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- Definition

Number Of Shares To Companys Maximum Award Level For Eligible Employees

+ References

No definition available.

+ Details

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- Definition

Percentage of performance share awards upon which the market condition was applied as laid out in the 2012 revisions to the company's incentive compensation agreement

+ References

No definition available.

+ Details

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- Definition

Percentage of performance share awards upon which the performance condition was applied as laid out in the 2012 revisions to the company's incentive compensation agreement

+ References

No definition available.

+ Details

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- Definition

Stock Price Fixed For Performance Share Awar Compensation Expense

+ References

No definition available.

+ Details

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- Definition

Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-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 (a)(1)

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

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