Long-term Equity-based Compensation Plans Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	3,429,804	3,632,398
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 38.93	$ 40.70
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 5 months 1 day
Range of Exercise Prices $10.00 - $15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 10.00
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 15.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	204,500
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 13.55
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	6 years 4 months 6 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	204,500
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 13.55
Range of Exercise Prices $15.01 - $20.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 15.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 20.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	8,000
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 16.48
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	6 years 7 months 6 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	8,000
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 16.48
Range of Exercise Prices $20.01 - $25.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 20.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 25.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	313,750
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 23.74
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	7 years 6 months 7 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	176,312
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 23.64
Range of Exercise Prices $25.01 - $30.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 25.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 30.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	636,000
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 28.56
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	8 years 3 months 15 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	292,373
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 28.03
Range of Exercise Prices $30.01 - $35.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 30.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 35.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	6,614
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 31.92
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	6 years 1 month 2 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	2,614
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 31.18
Range of Exercise Prices $35.01 - $40.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 35.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 40.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	340,577
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 37.25
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	5 years 2 months 9 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	340,577
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 37.25
Range of Exercise Prices $40.01 - $45.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 40.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 45.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	400,084
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 43.56
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	1 year 9 months 22 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	400,084
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 43.56
Range of Exercise Prices $45.01 - $50.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 45.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 50.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	1,185,747
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 48.62
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	2 years 8 months 19 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	1,185,747
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 48.62
Range of Exercise Prices $50.01 - $55.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 50.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 55.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	334,532
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 50.85
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	1 year 3 months 11 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	334,532
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 50.85
Range of Exercise Prices $10.00 - $50.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 10.00
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 55.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	3,429,804
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 38.93
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 5 months 1 day
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	2,944,739
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 40.79