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Debt (Narrative - Convertible Senior Subordinated Notes) (Details) - Convertible Senior Subordinated Notes - USD ($)
$ in Millions
Dec. 31, 2016
Apr. 30, 2013
Jan. 31, 2012
January 2012 Notes      
Debt Instrument [Line Items]      
Coupon rate 4.00%    
Principal amount of notes     $ 45
Equity component     $ 10
Effective interest rate of liability component 9.56%    
April 2013 Notes      
Debt Instrument [Line Items]      
Coupon rate 1.25%    
Principal amount of notes   $ 60