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Stock-Based Compensation (Summary of Restricted Stock Award Activity) (Details) (Restricted Stock Awards [Member], USD $)
In Millions, except Share data in Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Restricted Stock Awards [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 
Shares outstanding at the beginning of the year, number of shares4,297
Shares granted, number of shares886[1]
Shares vested, number of shares(1,580)[2]
Shares forfeited, number of shares(60)
Shares outstanding at the end of the period, number of shares3,543
Shares granted, weighted-average grant-date fair value$ 37.04
Weighted-average requisite service period (years)2.5Y
Expected volatility rate on restricted stock awards48.00%
Fair value of shares on vesting date$ 68.8
[1]Weighted-average grant-date fair value of $37.04 per share and a weighted-average requisite service period of 2.5 years. The awards with market conditions included an expected volatility of 48% in the Monte Carlo simulation used to measure grant-date fair value.
[2]Fair value on vesting date of $68.8 million.