Stock-Based Incentive Plan (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Total unrecognized compensation expense, net of estimated forfeitures	$ 57.3
Weighted-average period over which total unrecognized compensation expense expected to be recognized (years)	1.85
Intrinsic value of stock-based awards exercised and restricted stock units converted	61.2	32.6
2003 Plan [Member]
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)	6.10
Average remaining contractual term for options vested and expected to vest (years)	5.98
Average remaining contractual term for options exercisable (years)	4.71
Aggregate intrinsic value for options outstanding	35.5
Aggregate intrinsic value for options vested and expected to vest	34.3
Aggregate intrinsic value for options exercisable	$ 29.2

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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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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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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 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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