Share Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Share-Based Compensation [Abstract]

Fair Value of Stock Options Granted and Major Assumptions Used

The calculated fair value of options granted and major assumptions used in the model at the date of grant are listed below:

	2011			2010			2009
	Stock Option Variables			Stock Option Variables			Range of Stock Option  Variables
Fair value of options at grant date	$	18.80		$	27.55		$	31.06 - $35.38
Risk-free interest rate		2.1	%		2.3	%		1.78% - 2.51	%
Expected price volatility		54.7	%		30.3	%		28.1% - 29.9	%
Expected dividend yield		0.21	%		1.18	%		1.39% - 1.61	%
Expected life in years		5.0			5.2			5.0 - 5.0

Stock Option Activity

Stock option transactions under the terms of the LTSIP for the year ended December 31, 2011, are summarized below:

	Options Outstanding			Weighted- Average Price		Aggregate Intrinsic Value
						(in millions)
Balance at December 31, 2010		1,914,922			19.02
Granted		202,235			39.07
Exercised		(111,797	)		15.69
Forfeited		(1,666	)		23.98
Balance at December 31, 2011		2,003,694		$	21.23	$	18.1

Stock Options Outstanding, by exercise price range

		Options Outstanding				Options Exercisable					Unvested Options
	Range of Exercise Prices	Number Outstanding at December 31, 2011	Weighted- Average Remaining Term in Years		Weighted- Average Exercise Price	Number Exercisable at December 31, 2011		Weighted- Average Exercise Price	Aggregate Intrinsic Value		Number Unvested at December 31, 2011		Weighted- Average Exercise Price
									(in millions)
$	7.78 - $11.89	582,050	0.6	$	8.57	582,050	$	8.57			-	$	-
	19.37 - 27.84	1,219,409	3.7		24.31	827,557		23.99			391,852		25.00
	39.07	202,235	6.2		39.07	-		-			202,235		39.07
		2,003,694	3.1	$	21.23	1,409,607	$	17.62	$	16.5	594,087	$	29.79

Restricted Shares and Performance Share Units Activity

Transactions involving restricted shares under the terms of the LTSIP are summarized below:

	Restricted Shares Outstanding			Weighted-Average Price
Unvested balance at December 31, 2010		966,961			29.05
Granted		465,653			38.50
Vested		(307,140	)		28.82
Forfeited		(25,722	)		35.71
Unvested balance at December 31, 2011		1,099,752		$	32.78

Transactions involving performance shares units under the terms of the LTCIP are summarized below:

	Performance Shares Outstanding			Weighted-Average Price
Unvest balance at January 1, 2011		-		$	-
Granted		116,074			39.07
Distributed		-			-
Forfeited		(800	)		39.07
Unvested balance at December 31, 2011		115,274		$	39.07