Stock Plans (Tables)

12 Months Ended

Dec. 31, 2011

Stock Option Activity

The following table summarizes stock option activity under all plans:

Options outstanding	Shares			Weighted average exercise price		Weighted average remaining contractual life		Aggregate intrinsic value
Balance January 1, 2011		7,967,416		$	31.34
Granted		817,707			36.73
Exercised		(839,886	)		25.03
Forfeited		(45,203	)		32.86
Expired		(62,338	)		40.06
Balance December 31, 2011		7,837,696		$	32.50		5.6	$	20,161,647
Options exercisable as of December 31, 2011		5,694,049		$	32.38		4.6	$	16,052,331
Options expected to vest as of December 31, 2011		2,107,848		$	32.82		8.2	$	4,109,316

Assumptions Used in Calculating Estimated Fair Value of Stock Option Award

We estimated the fair values using the Black-Scholes option-pricing model, modified for dividends and using the following assumptions:

	2011			2010			2009
Risk-free interest rate		1.51	%		2.45	%		1.77	%
Expected dividend yield		2.32	%		2.30	%		3.20	%
Expected stock price volatility		35.50	%		35.00	%		32.50	%
Expected lives		5.5 yrs			5.5 yrs			5.2 yrs

Restricted Share Award Activity

The following table summarizes restricted share award activity under all plans:

Restricted shares outstanding	Shares			Weighted average grant date fair value
Balance January 1, 2011		1,309,403		$	29.33
Granted		278,418			36.60
Vested		(276,956	)		31.63
Forfeited		(60,783	)		28.32
Balance December 31, 2011		1,250,082		$	30.49