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Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Recurring Basis (Details) - Measured on Recurring Basis - USD ($)
$ in Millions
Jun. 28, 2015
Dec. 28, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds $ 3.3 $ 3.3
Available-for-sale investment 107.8 97.9
Total assets at fair value 111.1 101.2
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 3.3 3.3
Available-for-sale investment 107.8 97.9
Total assets at fair value 111.1 101.2
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0.0 0.0
Available-for-sale investment 0.0 0.0
Total assets at fair value 0.0 0.0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0.0 0.0
Available-for-sale investment 0.0 0.0
Total assets at fair value $ 0.0 $ 0.0