Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Share-based Compensation [Abstract]

Summary of Restricted Stock Award Activity

	Number of Shares
	(In thousands of shares)
Shares outstanding at January 1, 2012	3,403
Shares granted(a)	836
Shares vested(b)	(1,942	)
Shares forfeited	(8	)
Shares outstanding at March 31, 2012	2,289

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(a) Weighted-average grant-date fair value of $38.28 per share and a weighted-average requisite service period of 2.5 years. The awards with market conditions included an expected volatility of 31% in the Monte Carlo simulation used to measure grant-date fair value.

(b) Fair value on vesting date of $99.7 million.