Stock-Based Compensation Plans (Details 1) (USD $)	3 Months Ended
	Mar. 31, 2013
Employee Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, Shares	2,203,005
Weighted Average Exercise Price, Beginning balance	$ 45.90
Granted, Shares	0
Exercised, Shares	(131,608)
Weighted Average Exercise Price, Exercised	$ 36.66
Canceled or expired, Shares	(34,869)
Weighted Average Exercise Price, Canceled or expired	$ 54.46
Ending balance, Shares	2,036,528.000000
Weighted Average Exercise Price, Ending Balance	$ 46.35
Options exercisable at end of period, Shares	1,442,632
Weighted Average Exercise Price, Options exercisable at end of period	$ 40.42
Non-Employee Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, Shares	308,908
Weighted Average Exercise Price, Beginning balance	$ 39.35
Granted, Shares	3,187
Weighted Average Exercise Price, Granted	$ 44.70
Exercised, Shares	(330)
Weighted Average Exercise Price, Exercised	$ 40.70
Ending balance, Shares	311,765.000000
Weighted Average Exercise Price, Ending Balance	$ 39.40
Options exercisable at end of period, Shares	269,597
Weighted Average Exercise Price, Options exercisable at end of period	$ 36.12