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Debt Convertible Debt (Details) (USD $)
12 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2010
Convertible obligations [Member]
Dec. 31, 2009
Convertible obligations [Member]
Dec. 31, 2008
Convertible obligations [Member]
Dec. 31, 2009
2.5% Senior Convertible Notes due 2023 [Member]
Nov. 09, 2006
2.5% Senior Convertible Notes due 2023 [Member]
Dec. 31, 2009
2.5% Senior Convertible Notes due 2023 [Member]
Dec. 31, 2010
2.5% Senior Convertible Notes due 2023 [Member]
Nov. 09, 2006
Floating Rate Convertible Senior Debentures due 2033 [Member]
Dec. 31, 2009
Floating Rate Convertible Senior Debentures due 2033 [Member]
Dec. 31, 2010
Floating Rate Convertible Senior Debentures due 2033 [Member]
Dec. 31, 2010
3.25% Senior Subordinated Convertible Notes Due 2024 [Member]
Dec. 31, 2009
3.25% Senior Subordinated Convertible Notes Due 2024 [Member]
Nov. 09, 2006
3.25% Senior Subordinated Convertible Notes Due 2024 [Member]
Debt Issuance [Line Items]                                
Face Amount Issued               $ 300,000,000     $ 344,400,000         $ 330,000,000
Debt Instrument, Interest Rate, Stated Percentage               2.50%               3.25%
Debt Instrument, Description of Variable Rate Basis                     annual rate of 90-day LIBOR minus 1.25%          
Conversion Price per Share               23.73     29.55     40.20   40.20
Debt Instrument Convertible, Trigger Price               28.48     38.41     48.24   48.24
Convertible Subordinated Debt, Current                           100,000,000    
Principal Amount of Convertible Debt       329,300,000 668,800,000                      
Unamortized Discount 3,800,000     1,400,000 10,900,000   400,000         1,500,000   1,400,000 9,000,000  
Net Carrying Amount       327,900,000 657,900,000                      
Incremental Convertible Debt Obligation (Temporary Equity) 0 1,900,000   0 1,900,000                      
Debt Instrument Convertible Carrying Amount Of The Equity Component       18,100,000 30,700,000                      
Remaining Weighted Average Discount Amortization Period (Months)       3                        
Contractual Coupon Interest       10,900,000 18,400,000 25,000,000                    
Amortization of Discount on Convertible Debt 9,100,000 22,500,000 21,600,000 9,100,000 22,500,000 21,600,000                    
Interest Expense       20,000,000 40,900,000 46,600,000                    
Effective Interest Rate       4.70% 4.30% 5.10%                    
Extinguishment Of Debt [Line Items]                                
Extinguishment Of Debt Amount                 282,300,000 13,000,000     326,000,000      
Redemption Price per $1000 of Par Value                 2,072.4743              
Extinguishment of Debt, Total Cash Outlay                 586,600,000 28,000,000     573,000,000      
Gains (Losses) On Extinguishment Of Debt $ (17,000,000) $ (15,000,000)             $ (10,000,000)