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Fair Value Measurements Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 28, 2014
Sep. 29, 2013
Jun. 30, 2013
Sep. 28, 2014
Sep. 29, 2013
Dec. 29, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Money market funds $ 3.3     $ 3.3   $ 2.9
Available-for-sale investment 94.3     94.3   80.7
Total assets at fair value 97.6     97.6   83.6
Other comprehensive income (loss), Unrealized gains (losses) on Investment (1.9) 4.5   8.6 28.3  
Available-for-sale Equity Securities, Amortized Cost Basis 19.0     19.0   19.7
Asset impairments 0 0 1.7 0 1.7  
Level 1
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Money market funds 3.3     3.3   2.9
Available-for-sale investment 94.3     94.3   80.7
Total assets at fair value 97.6     97.6   83.6
Level 2
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Money market funds 0     0   0
Available-for-sale investment 0     0   0
Total assets at fair value 0     0   0
Level 3
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Money market funds 0     0   0
Available-for-sale investment 0     0   0
Total assets at fair value 0     0   0
Temp Holdings Investment
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other comprehensive income (loss), Unrealized gains (losses) on Investment $ (1.9) $ 4.5   $ 8.6 $ 28.3