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Financings and Capitalization (Contingently Convertible Securities) (Details) (USD $)
6 Months Ended
Jun. 30, 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 $ 13.94
Adjusted Trigger Price $ 18.12
Senior Notes Interest Rate 5.50%
2.875% Convertible Senior Notes Due 2024 [Member]
 
Senior Notes Interest Rate 2.875%
Conversion Date January 2012
Principal Converted 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
2.875% Senior Notes [Member]
 
Conversion Date April 2012
Principal Converted 153,000,000
Conversion Value per share of principal 1,774.98
Common Stock Issued on Settlement 5,381,349
Cash Paid on Settlement $ 153,000,000