Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Mar. 31, 2010	Sep. 30, 2011	Dec. 31, 2010	Jan. 19, 2010	Jul. 20, 2007
Income Tax Expense (Benefit) [Abstract]
Withholding tax percentage proposed						30.00%
IRS assertion of additional taxes due						$ 84,000,000
Penalty percentage on asserted underpayment of tax					30.00%
Period for possible adjustment of tax liability reserves, in months	12		12
Total unrecognized tax benefits	561,200,000		561,200,000	534,100,000
Non-cash charge to income tax expense		40,500,000
Tax error correction	$ 30,000,000		$ 35,000,000