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Financings (Contingently Convertible Securities) (Details) (USD $)
1 Months Ended 3 Months Ended
Apr. 25, 2012
Mar. 31, 2012
Number of trading days, adjusted trigger price contingencies were met   20
Number of trading days   30
5.50% Senior Notes [Member]
   
Maturity Date   2029
Outstanding   $ 172,000,000
Adjusted Conversion Price   $ 14.08
Adjusted Trigger Price   $ 18.31
Senior Notes Interest Rate   5.50%
2.875% Convertible Senior Notes Due 2024 [Member]
   
Maturity Date   2024
Outstanding   153,000,000
Adjusted Conversion Price   $ 12.40
Adjusted Trigger Price   $ 14.88
Senior Notes Interest Rate   2.875%
Conversion Date   January 2012
Principal Converted 153,000,000 73,000,000
Conversion Value per share of principal   1,738.99
Common Stock Issued on Settlement   2,464,138
Cash Paid on Settlement   73,000,000
Settlement of Debt [Member] | 2.875% Convertible Senior Notes Due 2024 [Member]
   
Conversion Date   April 25, 2012
Principal Converted 102,000,000  
Conversion Value per share of principal 1,771.76  
Debt Issuance, Principal 1,000  
Common Stock Issued on Settlement 3,584,558  
Cash Paid on Settlement 102,000,000  
Debt to be Settled [Member[ | 2.875% Convertible Senior Notes Due 2024 [Member]
   
Principal Converted $ 51,000,000