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, 2015	Dec. 31, 2014
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	1,865,187	2,265,711
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 39.23	$ 39.74
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	5 years 0 months 29 days
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
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	4 years 1 month 7 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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	21,500
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 23.26
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 9 months 22 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	21,500
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 23.26
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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	187,125
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 29.12
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	6 years 5 months 5 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	141,123
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 28.97
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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	210,000
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 33.13
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	7 years 9 months 29 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	118,000
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 32.89
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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	821,125
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 36.67
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	7 years 0 months 7 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	389,123
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 37.10
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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	0
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 0.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	0 years
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 $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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	616,045
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 48.61
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	1 year 2 months 16 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	616,045
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 48.61
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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	1,392
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 50.04
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	0 years 1 month 6 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	1,392
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 50.04
Range of Exercise Prices $15.01 - $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	$ 15.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 55
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	1,865,187
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 39.23
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	5 years 1 month 2 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	1,295,183
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 40.96