Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award
Expense incurred for stock-based compensation plans	$ 7,061		$ 6,172	$ 13,381	$ 11,615
Expense incurred for stock-based compensation plans, net of tax	5,116		4,857	9,611	8,897
Stock option activity
Options outstanding at the beginning of the period (in shares)	12,126,570	12,706,324		12,706,324
Options granted (in shares)	2,506,350	35,000
Options exercised (in shares)	(303,328)	(576,454)
Options forfeited (in shares)	(82,300)	(38,300)
Options outstanding at the end of the period (in shares)	14,247,292	12,126,570		14,247,292
Vested and non-vested expected to vest at the end of the period (in shares)	13,152,814			13,152,814
Exercisable at the end of the period (in shares)	6,528,916			6,528,916
Weighted Average Exercise Price
Weighted average exercise price, options outstanding at the beginning of the period (in dollars per share)	$ 34.54	$ 33.93		$ 33.93
Weighted average exercise price, options granted (in dollars per share)	$ 53.48	$ 53.41		$ 53.48
Weighted average exercise price, options exercised (in dollars per share)	$ 31.42	$ 20.68		$ 31.42
Weighted average exercise price, options forfeited (in dollars per share)	$ 38.10	$ 37.49		$ 38.10
Weighted average exercise price, options outstanding at the end of the period (in dollars per share)	$ 37.92	$ 34.54		$ 37.92
Weighted average exercise price, vested and non-vested expected to vest at the end of the period (in dollars per share)	$ 37.42			$ 37.42
Weighted average exercise price, exercisable at the end of the period (in dollars per share)	$ 31.42			$ 31.42
Weighted average remaining contractual term of options outstanding at the beginning of the period (in years)	7.08	7.18		7.18
Weighted average remaining contractual term of options outstanding at the end of the period (in years)	7.38	7.08		7.38
Weighted average remaining contractual term of options vested and non-vested expected to vest at the end of the period (in years)				7.27
Weighted average remaining contractual term of options exercisable at the end of the period (in years)				5.90
Aggregate intrinsic value of options outstanding at the beginning of the period (in dollars)	240,698	239,534		239,534
Aggregate intrinsic value of options outstanding at the end of the period (in dollars)	228,952	240,698		228,952
Aggregate intrinsic value of options, vested and non-vested expected to vest at the end of the period (in dollars)	218,000			218,000
Aggregate intrinsic value of options exercisable at the end of the period (in dollars)	147,365			147,365
Status of the Company's non-vested options and changes during the year
Non-vested options at the beginning of the period (in shares)	7,620,676	7,623,976		7,623,976
Non-vested options, options granted (in shares)	2,506,350	35,000
Non-vested options, options vested (in shares)	(2,326,350)
Non-vested options, options forfeited (in shares)	(82,300)	(38,300)
Non-vested options at the end of the period (in shares)	7,718,376	7,620,676		7,718,376
Weighted Average Fair Value at Grant Date
Weighted average fair value at the grant date, options outstanding at the beginning of the period (in dollars per share)	$ 12.80	$ 12.78		$ 12.78
Weighted average fair value at grant date, options granted (in dollars per share)	$ 14.15	$ 16.98
Weighted average fair value at grant date, options forfeited (in dollars per share)	$ 12.82	$ 12.63
Weighted average fair value at grant date, options vested (in dollars per share)	$ 12.23
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share)	$ 13.41	$ 12.80		$ 13.41
Total intrinsic value of stock options exercised (in dollars)	6,739		5,914	26,402	9,699
Total fair value of stock options vested (in dollars)	28,446		23,665	28,446	23,667
Total compensation cost related to non-vested options not yet recognized (in dollars)	$ 88,665			$ 88,665
Weighted average expected amortization period (in years)				3.66
2009 Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares available for the granting of additional stock options (in shares)	7,624,150			7,624,150
2000 Option Plan and 2009 Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options ratable vesting period (in years)				5Y
Options exercisable period (in years)				10Y
Directors Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares available for the granting of additional stock options (in shares)	80,000			80,000
Options ratable vesting period (in years)				3Y
Options exercisable period (in years)				10Y