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Investments - Other Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 09, 2015
Oct. 03, 2015
Oct. 03, 2015
Remeasured fair value - equity investment $ 12.9    
Remeasurement gain, net of acquisition costs and incremental R&D expenses   $ 3.0 $ 3.0
Other Noncurrent Assets [Member]      
Equity investment original cost $ 6.0    
General and Administrative Expense [Member]      
Remeasurement gain, net of acquisition costs   3.5 3.5
Acquisition Related Costs   3.4 3.4
Research and Development Expense [Member]      
Incremental research and development expense   $ 0.5 $ 0.5