Long-term Equity-based Compensation Plans Disclosure of Share-based Compensation Arrangements by Share-based Payment Awards (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 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	283,750
Options and Stock Appreciation Rights, Grants in Period, Weighted Average Exercise Price	$ 33.20
Options and Stock Appreciation Rights, Exercises in Period	(190,000)
Options and Stock Appreciation Rights, Exercises in Period, Weighted Average Exercise Price	$ 24.77
Options and Stock Appreciation Rights, Forfeitures and Expirations in Period	(493,756)
Options and Stock Appreciation Rights, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 42.55
Options and Stock Appreciation Rights, Outstanding at End of the Year, Number	2,792,048
Options and Stock Appreciation Rights, Outstanding at End of the Year, Weighted Average Exercise Price	$ 40.50
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	3 years 10 months 21 days
Options and Stock Appreciation Rights, Outstanding at End of Period, Intrinsic Value	$ 4,300,000
Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding at End of Period, Number	2,759,163
Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding at End of Period, Weighted Average Exercise Price	$ 40.61
Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding at End of Period, Weighted Average Remaining Contractual Term	3 years 10 months 2 days
Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding at End of Period, Aggregate Intrinsic Value	4,200,000
Options and Stock Appreciation Rights, Vested and Expected to Vest, Exercisable at End of Period, Number	2,466,795
Options and Stock Appreciation Rights, Vested and Expected to Vest, Exercisable at End of Period, Weighted Average Exercise Price	$ 41.72
Options and Stock Appreciation Rights, Vested and Expected to Vest, Exercisable at End of Period, Weighted Average Remaining Contractual Term	3 years 3 months 4 days
Options and Stock Appreciation Rights, Vested and Expected to Vest, Exercisable at End of Period, Aggregate Intrinsic Value	3,500,000
Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 10.20	$ 9.40
Options, Exercises in Period, Total Intrinsic Value	1,800,000	100,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	600,000	0
Cash Exercise of Stock Options	$ 600,000	$ 0