Share Based Compensation (Details Textuals) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share Based Compensation Details [Abstract]
Companys Closing Stock Price Last Day Of Year	$ 29.63
Number Of In The Money Options Exercisable	100,000
Fair Value Of Options Vesting In The Period	6,400,000	9,800,000	3,900,000
Total intrinsic value of stock options excercised	21,500,000	50,700,000	33,200,000
Long Term Incentive Program Period	10,700,000	8,600,000	5,800,000
Long Term Incentive Program Total 2009 Program	24,100,000
Long Term Incentive Program Total 2010 Program	12,000,000
Long Term Incentive Program Total 2011 Program	12,100,000
Long Term Incentive Program Total 2008 Program	$ 4,300,000
Long Term Incentive Program Total 2008 Program Shares	41,443