Income Taxes (Narratives) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Income Tax Contingency [Line Items]
Income tax reconciliation, repatriation of assets	$ 125,000,000
Valuation allowance, amount	231,400,000
Valuation allowance, change in amount	700,000
Net operating loss carryforwards	2,400,000,000
Operating loss carryforward limit, percentage	20.00%
Operating loss carryforward limit, amount	3,000,000
Foreign net operating loss carryforwards, perpetuity	350,000,000
State tax credit carryforward	19,100,000
Foreign capital loss carryforward	59,500,000
Foreign capital loss carryforward, expires	2017
Uncertain tax position, likelihood of being sustained, threshold percentage	50.00%
Unrecognized tax benefit	162,885,000	203,350,000	237,541,000	166,513,000
Unrecognized tax benefits that would impact effective tax rate	148,400,000	188,000,000
Accrued interest and penalties	23,900,000	27,000,000
Interest expense related to uncertain tax positions	(700,000)	9,100,000	6,600,000
Change in unrecognized tax benefits possible within next 12 months, lower range	29,000,000
Change in unrecognized tax benefits possible within next 12 months, upper range	110,000,000
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	1,900,000,000
Foreign Country [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 500,000,000