Long-term Equity-based Compensation Plans Disclosure of Share-based Compensation Arrangements by Share-based Payment Awards (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options and Stock Appreciation Rights, Outstanding at Beginning of the Year, Number	3,192,054
Options and Stock Appreciation Rights, Outstanding at Beginning of the Year, Weighted Average Exercise Price	$ 40.53
Options and Stock Appreciation Rights, Grants in Period, Gross	247,750
Options and Stock Appreciation Rights, Grants in Period, Weighted Average Exercise Price	$ 33.45
Options and Stock Appreciation Rights, Exercises in Period	(58,500)
Options and Stock Appreciation Rights, Exercises in Period, Weighted Average Exercise Price	$ 25.76
Options and Stock Appreciation Rights, Forfeitures and Expirations in Period	(451,188)
Options and Stock Appreciation Rights, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 42.27
Options and Stock Appreciation Rights, Outstanding at End of the Year, Number	2,930,116
Options and Stock Appreciation Rights, Outstanding at End of the Year, 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, Outstanding at End of Period, Intrinsic Value	$ 4,600,000
Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding at End of Period, Number	2,886,465
Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding at End of Period, Weighted Average Exercise Price	$ 40.10
Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 4 months 10 days
Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding at End of Period, Aggregate Intrinsic Value	4,500,000
Options and Stock Appreciation Rights, Vested and Expected to Vest, Exercisable at End of Period, Number	2,358,551
Options and Stock Appreciation Rights, Vested and Expected to Vest, Exercisable at End of Period, Weighted Average Exercise Price	$ 42.32
Options and Stock Appreciation Rights, Vested and Expected to Vest, Exercisable at End of Period, Weighted Average Remaining Contractual Term	3 years 4 months 10 days
Options and Stock Appreciation Rights, Vested and Expected to Vest, Exercisable at End of Period, Aggregate Intrinsic Value	3,100,000
Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 10.23	$ 9.39
Options, Exercises in Period, Total Intrinsic Value	300,000	100,000
Tax Benefit from Stock Options Exercised	100,000	0
Proceeds from Stock Options Exercised	$ 0	$ 0