Stock-Based Incentive Plan (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense, net of estimated forfeitures	$ 53.1
Weighted-average period over which total unrecognized compensation expense expected to be recognized (years)	1.86
Intrinsic value of stock-based awards exercised and restricted stock units converted	62.3	41.9
Granted, number of restricted stock awards	1,392,690
Stock based awards, granted	1,392,690
2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for issuance to employees	37,500,000
Stock option award vesting period, minimum (years)	three
Stock option award vesting period, maximum (years)	four
Stock option awards expiration (years)	ten
Maximum shares that may be issued as restricted shares, restricted units, performance shares and stock awards	8,000,000
Average remaining contractual term for options outstanding (years)	5.90
Average remaining contractual term for options vested and expected to vest (years)	5.77
Average remaining contractual term for options exercisable (years)	4.47
Aggregate intrinsic value for options outstanding	101.9
Aggregate intrinsic value for options vested and expected to vest	99.1
Aggregate intrinsic value for options exercisable	$ 85.2
Vest Ratably Over Three Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion Of Awards Vesting	437,828
Stock based awards, period due, years	3 years
Vest In Three Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion Of Awards Vesting	913,678
Stock based awards, period due, years	3 years
Vest After One Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion Of Awards Vesting	41,184

Portion Of Awards Vesting

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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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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number Of Shares Authorized

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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

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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.

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-Publisher FASB

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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The maximum vesting term 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.

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The minimum vesting term 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.

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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).

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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).

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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.

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The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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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.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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The weighted-average period between the balance sheet date and expiration date for fully vested and expected to vest options outstanding, which may be expressed in a decimal value for number of years.

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