Income Taxes (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jan. 19, 2010	Jul. 20, 2007
Withholding tax percentage proposed				30.00%
Penalty percentage on asserted underpayment of tax			30.00%
Total unrecognized tax benefits	$ 537.5	$ 533.7
2002 Tax Year [Member]
Potential Additional Withholding Taxes - Minimum	20
Potential Additional Withholding Taxes Maximum	30
IRS assertion of additional taxes due				84
Potential Increase to Tax Liability - Minimum	104
Potential Increase to Tax Liability - Maximum	114
2003 to 2006 Tax Years [Member]
IRS assertion of additional taxes due	665
IRS Assertion of Additional Withholding Tax Due	455
2002 to 2006 Tax Years [Member]
IRS Assertion of Additional Income Tax on Dividends Due	$ 210
Penalty Percentage On Asserted Underpayment Of Income Tax On Dividends	20.00%