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Cash Equivalents and Investments (Available for sales securities) (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2016
Jan. 01, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost $ 94.9  
Gross Unrealized Gains 0.0  
Gross Unrealized Losses 0.0  
Available-for-sale Securities, Debt Securities, Fair Value 94.9  
Cash and Cash Equivalents, at Amortized Cost 32.8  
Short-term Investments, Amortized Cost 62.1  
Cash and Cash Equivalents, Fair Value 32.8  
Short-term investments Fair Value 62.1 $ 0.0
Available-for-sale Securities, Total Fair Value 94.9 $ 0.0
Available-for-sale Securities, Gross Realized Gain (Loss) 0.0  
Available-for-sale Securities, Gross Unrealized Gain (Loss) 0.0  
US Treasury Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost 11.7  
Gross Unrealized Gains 0.0  
Gross Unrealized Losses 0.0  
Available-for-sale Securities, Debt Securities, Fair Value [1] 11.7  
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost 10.0  
Gross Unrealized Gains 0.0  
Gross Unrealized Losses 0.0  
Available-for-sale Securities, Debt Securities, Fair Value [1] 10.0  
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost 15.8  
Gross Unrealized Gains 0.0  
Gross Unrealized Losses 0.0  
Available-for-sale Securities, Debt Securities, Fair Value [1] 15.8  
Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost 57.4  
Gross Unrealized Gains 0.0  
Gross Unrealized Losses 0.0  
Available-for-sale Securities, Debt Securities, Fair Value [1] $ 57.4  
[1] The Company’s available-for sale securities are valued using readily available pricing sources for comparable instruments, or model-driven valuations using significant inputs derived from or corroborated by observable market data, including yield curves and credit ratings.