Stock-Based Incentive Plan (Narrative) (Details) (USD $) In Millions, except 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]
Granted, number of restricted stock awards	936,512
Total unrecognized compensation expense, net of estimated forfeitures	$ 46.0
Weighted-average period over which total unrecognized compensation expense expected to be recognized (years)	1 year 7 months 3 days
Intrinsic value of stock-based awards exercised and restricted stock units converted	111.7	62.3
Vest Ratably Over Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, number of restricted stock awards	437,919
Vest In Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, number of restricted stock awards	438,979
Vest After One Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, number of restricted stock awards	46,872
Vest After Two Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, number of restricted stock awards	12,742
Restricted Shares, Restricted Units, Performance Shares and Other Stock-Based Awards \| Vest Ratably Over Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award vesting period	3 years
Restricted Shares, Restricted Units, Performance Shares and Other Stock-Based Awards \| Vest In Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award vesting period	3 years
Restricted Shares, Restricted Units, Performance Shares and Other Stock-Based Awards \| Vest After Two Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award vesting period	2 years
Long Term Incentive Plan 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for issuance to employees	55,300,000
Average remaining contractual term for options outstanding (years)	6 years 6 months 20 days
Average remaining contractual term for options vested and expected to vest (years)	6 years 5 months 4 days
Average remaining contractual term for options exercisable (years)	5 years 0 months 20 days
Aggregate intrinsic value for options outstanding	131.5
Aggregate intrinsic value for options vested and expected to vest	125.7
Aggregate intrinsic value for options exercisable	$ 92.6
Long Term Incentive Plan 2003 \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award expiration period	10 years
Long Term Incentive Plan 2003 \| Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award vesting period	4 years
Long Term Incentive Plan 2003 \| Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award vesting period	3 years

Period after which equity based award expires.

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period, Total Intrinsic Value And Equity Instruments Other Than Options, Vested In Period, Intrinsic Value

+ References

No definition available.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ 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)

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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.

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- Definition

Period 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, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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

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

-Publisher FASB

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-Topic 718

-SubTopic 10

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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