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Income Tax (Narrative Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Income Tax [Abstract]            
Cumulative Tax Benefit Adjustment   $ 30,700,000        
Unrecorded Tax Benefit Adjustment Impact By Year     12,000,000 9,000,000 6,000,000 3,000,000
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability 663,900,000 777,300,000        
Proceeds from Income Tax Refunds 16,200,000 11,100,000 37,500,000      
Cash paid for income taxes 113,200,000 140,100,000 48,000,000      
Operating Loss Carryforwards 555,400,000 562,700,000        
Operating Loss Carryforwards With Expiration Dates 293,700,000          
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 30,800,000          
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 3,100,000          
Significant Change in Unrecognized Tax Benefits, Nature of Uncertainty Statute of limitations          
Unrecognized Tax Benefits, Interest on Income Taxes Expense 9,900,000 7,100,000 (1,400,000)      
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 49,600,000 39,800,000        
Tax Adjustments Provision For Active Financing Exception 1,000,000          
TaxAdjustmentsSettlementsAndUnusualProvisions $ 4,200,000