Long-term Equity-based Compensation Plans Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
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	2,930,116	3,192,054
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 39.95	$ 40.53
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 5 months 5 days
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	35,000
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	5 years 10 months 6 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	35,000
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 1 month 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	207,500
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 23.61
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	6 years 10 months 2 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	150,062
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	507,250
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 28.76
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	8 years 2 months 9 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	219,873
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 28.44
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	226,750
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 33.43
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	9 years 10 months 2 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	0
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 0.00
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	336,750
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	4 years 7 months 10 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	336,750
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	366,252
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 43.57
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	1 year 4 months 6 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	366,252
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 43.57
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	999,722
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 48.64
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	2 years 7 months 6 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	999,722
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 48.64
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	242,892
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 50.52
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	1 year 1 month 21 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	242,892
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 50.52
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	2,930,116
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 39.95
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 5 months 5 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	2,358,551
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 42.32