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Notes Payable (2015 Notes Narrative) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 15, 2015
Sep. 30, 2014
September 2015 Notes [Member]    
Debt Instrument [Line Items]    
Extinguishment of debt, cash paid $ 48.2 $ 52.9
Extinguishment of debt, amount 22.4 46.5
Extinguishment of debt, cash paid for shares of common stock   $ 33.1
Extinguishment of debt, shares issued   1,496,664
Extinguishment of debt, carrying value at extinguishment   $ 43.8
Extinguishment of debt, loss, net of tax   $ (5.4)
2015 Notes Embedded Conversion Derivative [Member]    
Debt Instrument [Line Items]    
Derivative liability, cash paid to settle conversion premium $ 25.8