Share-Based Employee Compensation Plans and Other Compensation and Benefit Plans (Stock Option Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012
Vesting of options, description	The Company's stock-based incentive plans provide for the granting of stock options for the purchase of common stock of the Company to directors and certain key employees of the Company. Options are granted at an exercise price that is equal to the closing market price of the Company's common stock on the date of the grant. Director options granted under the plans expire after seven years and are fully vested after six months. Employee options granted under the plans expire after ten years and typically vest 25% per year, over four years. The Company records compensation expense for the grant date fair value of the option awards, adjusted for estimated forfeitures, evenly over the vesting period.
Employee Stock Option [Member]
Options expiration date, years	ten
Options vesting period	four
Option vesting rate per year	25.00%
Stock Option [Member]
Remaining unrecognized compensation expense	33.9
Weighted-average period for cost recognition, years	3.0
Stock Option [Member] \| Director [Member]
Options expiration date, years	seven
Options vesting period	six

Share-Based Employee Compensation Plans and Other Compensation and Benefit Plans (Stock Option Narrative) (Details) (USD $)
In Millions, unless otherwise specified

3 Months Ended

Mar. 31, 2012

The Company's stock-based incentive plans provide for the granting of stock options for the purchase of common stock of the Company to directors and certain key employees of the Company. Options are granted at an exercise price that is equal to the closing market price of the Company's common stock on the date of the grant. Director options granted under the plans expire after seven years and are fully vested after six months. Employee options granted under the plans expire after ten years and typically vest 25% per year, over four years. The Company records compensation expense for the grant date fair value of the option awards, adjusted for estimated forfeitures, evenly over the vesting period.

Employee Stock Option [Member]

Options expiration date, years

ten

Options vesting period

four

Option vesting rate per year

25.00%

Stock Option [Member]

Remaining unrecognized compensation expense

33.9

Weighted-average period for cost recognition, years

3.0

Stock Option [Member] | Director [Member]

Options expiration date, years

seven

Options vesting period

six

- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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