Share-Based Compensation Plans (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y
Information about options in various price ranges
Outstanding Shares	3,297
Weighted Average Remaining Contractual Term	3.9
Weighted Average Exercise Price	$ 44.25
Options Exercisable, shares	1,845
Options Exercisable, weighted average exercise price	$ 47.07
Stock Option Price Range One [Member]
Information about options in various price ranges
Lower limit price range	$ 0.00
Upper limit price range	$ 35.00
Outstanding Shares	1,247
Weighted Average Remaining Contractual Term	4.6
Weighted Average Exercise Price	$ 32.78
Options Exercisable, shares	475
Options Exercisable, weighted average exercise price	$ 32.63
Stock Option Price Range Two [Member]
Information about options in various price ranges
Lower limit price range	$ 35.00
Upper limit price range	$ 45.00
Outstanding Shares	387
Weighted Average Remaining Contractual Term	1.2
Weighted Average Exercise Price	$ 42.40
Options Exercisable, shares	384
Options Exercisable, weighted average exercise price	$ 42.41
Stock Option Price Range Three [Member]
Information about options in various price ranges
Lower limit price range	$ 45.00
Upper limit price range	$ 55.00
Outstanding Shares	1,140
Weighted Average Remaining Contractual Term	4.5
Weighted Average Exercise Price	$ 50.68
Options Exercisable, shares	475
Options Exercisable, weighted average exercise price	$ 52.48
Stock Option Price Range Four [Member]
Information about options in various price ranges
55.00 and over	55.00 and over
Outstanding Shares	523
Weighted Average Remaining Contractual Term	3.2
Weighted Average Exercise Price	$ 58.94
Options Exercisable, shares	511
Options Exercisable, weighted average exercise price	$ 58.95