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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 29, 2013
Mar. 29, 2013
Fair Value, Measurements, Recurring [Member]
Warrant liability [Member]
Mar. 29, 2013
Fair Value, Measurements, Recurring [Member]
Assets held for sale [Member]
Mar. 29, 2013
Fair Value, Measurements, Recurring [Member]
Quoted Prices In Active markets for Identical Assets (Level 1) [Member]
Dec. 28, 2012
Fair Value, Measurements, Recurring [Member]
Quoted Prices In Active markets for Identical Assets (Level 1) [Member]
Mar. 29, 2013
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Dec. 28, 2012
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Mar. 29, 2013
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Inputs (Level 3) [Member]
Dec. 28, 2012
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]                  
Long-lived assets held for sale       $ 0 $ 0 $ 0 $ 0 $ 1.7 $ 7.5
Total       0 0 0 0 1.7 7.5
Liabilities [Abstract]                  
Warrant liability         0   0   12.2
Total         0   0   12.2
Senior convertible notes 16.6                
Estimated fair value of the Oaktree term loans 79.9                
Reconciliation of warrant liability [Roll Forward]                  
Fair value at December 28, 2012   12.2              
Settlement of warrant liability   15.1              
Foreign currency impact   0              
Fair value at March 29, 2013   0              
Change in fair value (included in other income (expense), net)   (2.9)              
Reconciliation of assets held for sale [Roll Forward]                  
Fair value at December 28, 2012     7.5            
Long-lived assets sold     (5.7)            
Foreign currency impact     (0.1)            
Fair value at March 29, 2013     1.7            
Change in fair value (included in other income (expense), net)     $ 0