Stock-Based Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2011

Stock-Based Compensation Plans (Tables) [Abstract]

Stock options

	Six Months Ended June 30, 2011
				Weighted Average		Remaining Contractual		Aggregate Intrinsic
	Shares			Exercise Price		Life (in years)		Value (in millions)
Number of shares under option:
Outstanding  –  January 1, 2011		68,071		$	40.48
Exercised		(11,900	)		34.57
Outstanding  –  June 30, 2011		56,171		$	41.73		4.0	$	3.8
Exercisable  –  June 30, 2011		56,171		$	41.73		4.0	$	3.8

Information regarding Restricted Shares

	Six Months Ended June 30, 2011
				Weighted Average
				Grant-Date Fair
	Shares			Value
Number of unvested shares:
Outstanding - January 1, 2011		1,259,377		$	77.05
Granted		216,644			130.51
Vested		(392,869	)		88.68
Cancelled		(25,186	)		77.58
Outstanding - June 30, 2011		1,057,966		$	83.67