Share-Based Compensation Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Unrecognized compensation expenses related to share-based payment arrangements	$ 93,700,000
Weighted-average period of recognizing unrecognized compensation expenses related to share-based compensation, in years	3
Share-based compensation	55,500,000	58,200,000	52,400,000
Cash received from stock option exercises	102,300,000	32,100,000	18,500,000
Plan Of 2003 [Member]
Number of remaining shares that may be issued	3,219,875
Directors' Plan [Member]
Number of remaining shares that may be issued	49,099
Stock Options [Member]
Unrecognized compensation expenses related to share-based payment arrangements	27,600,000
Share-based payment contractual terms, years	10
Minimum number of years for accelerated vesting	2
Share-based compensation	19,700,000	22,100,000	23,300,000
Stock options vested	489,648	1,105,398	1,166,246
Weighted average fair value of stock options vested	$ 22.80	$ 29.40	$ 25.68
Total intrinsic value of stock options exercised	88,700,000	21,300,000	23,200,000
Cash received from stock option exercises	106,500,000	34,300,000	23,300,000
Actual tax benefit realized from option exercises	31,600,000	7,100,000	7,100,000
Restricted Stock [Member]
Unrecognized compensation expenses related to share-based payment arrangements	39,400,000
Weighted-average period of recognizing unrecognized compensation expenses related to share-based compensation, in years	2
Share-based compensation	22,100,000	21,500,000	13,600,000
Other Restricted Stock Units [Member]
Unrecognized compensation expenses related to share-based payment arrangements	21,600,000
Weighted-average period of recognizing unrecognized compensation expenses related to share-based compensation, in years	4
Share-based compensation	4,600,000	4,800,000	4,900,000
Other Stock-Based Awards [Member]
Unrecognized compensation expenses related to share-based payment arrangements	400,000
Weighted-average period of recognizing unrecognized compensation expenses related to share-based compensation, in years	2
Share-based compensation	1,000,000	1,200,000	800,000
Nonvested other stock-based awards, shares outstanding	20,867	19,600
Management Stock Purchase Program [Member]
Unrecognized compensation expenses related to share-based payment arrangements	4,700,000
Weighted-average period of recognizing unrecognized compensation expenses related to share-based compensation, in years	3
Share-based compensation	5,600,000	6,500,000	7,300,000
Discount on common stock under management stock purchase program	30.00%
Minimum annual bonus percentage required to purchase restricted stock	25.00%
Vesting period, years	four
Employee Stock Purchase Plan [Member]
Share-based compensation	2,500,000	2,100,000	2,500,000
Percentage discount on stock for domestic and foreign employees	15.00%
After tax payroll deductions percentage of compensation, minimum	1.00%
After tax payroll deductions percentage of compensation, maximum	10.00%
Payroll deductions maximum amount of compensation	$ 25,000
Shares purchased under Employee Stock Purchase Plan	139,596	146,551
Shares available to purchase during period under Employee Stock Purchase Plan	42,274
Maximum [Member] | Stock Options [Member]
Awards requisite service period	five
Maximum [Member] | Restricted Stock [Member]
Awards requisite service period	seven
Maximum [Member] | Other Restricted Stock Units [Member]
Awards requisite service period	seven
Minimum [Member] | Stock Options [Member]
Awards requisite service period	four
Minimum [Member] | Restricted Stock [Member]
Awards requisite service period	four
Minimum [Member] | Other Restricted Stock Units [Member]
Awards requisite service period	four