Long-Term Equity Compensation (Details) (USD $)	12 Months Ended										0 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Restricted Stock Units and Performance Stock Units [Member]	Dec. 31, 2011 Restricted Stock Units and Performance Stock Units [Member]	Dec. 31, 2010 Restricted Stock Units and Performance Stock Units [Member]	Dec. 31, 2012 Performance Share Awards [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member]	May 21, 2009 Stock Options Before May 21, 2009 [Member]	May 21, 2009 2006 Long Term Incentive Plan [Member] Restricted Stock Units and Performance Stock Units [Member]	Dec. 31, 2012 2006 Long Term Incentive Plan [Member] Restricted Stock Units and Performance Stock Units [Member]	Dec. 31, 2012 2006 Long Term Incentive Plan [Member] Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 28,893,000	$ 27,602,000	$ 33,112,000	$ 23,500,000	$ 21,400,000	$ 26,800,000		$ 5,400,000	$ 6,200,000	$ 6,300,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 11,200,000	$ 10,700,000	$ 12,800,000
Reduction of shares available for grant												2	1.75	1
Stock option grants, maximum term								7 years			10 years
Vesting period, minimum								1 year
Vesting period, maximum								4 years
Vesting percentage of shares granted, minimum							0.00%
Vesting percentage of shares granted, maximum							100.00%
Shares reversed for issuance under Plans	11,900,000
Shares used to satisfy tax withholding and exercise price obligations	500,000