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Debt - Carrying Amounts of the Liability and Equity Components (Details) - USD ($)
$ in Millions
Jun. 30, 2018
May 29, 2018
Jul. 01, 2017
Mar. 22, 2017
Mar. 03, 2017
Aug. 21, 2013
Debt Instrument [Line Items]            
Long-term debt, net of current portion $ 557.9   $ 931.4      
Convertible Debt            
Debt Instrument [Line Items]            
Unamortized discount of liability component (121.1)   (129.4)      
Unamortized debt issuance cost (7.7)   (9.2)      
Carrying amount of liability component 833.2   931.4      
Current portion of long-term debt 275.3   0.0      
Long-term debt, net of current portion 557.9   931.4      
Carrying amount of equity component $ 239.1   229.7      
Convertible Debt | 0.625% Senior Convertible Notes            
Debt Instrument [Line Items]            
Interest rate on senior convertible notes 0.625%         0.625%
Principal amount of notes $ 277.0   610.0      
Unamortized debt issuance cost $ (0.1)          
Carrying amount of liability component           $ 515.6
Carrying amount of equity component           $ 134.4
Convertible Debt | 1.00% Senior Convertible Notes            
Debt Instrument [Line Items]            
Interest rate on senior convertible notes 1.00%     1.00% 1.00%  
Principal amount of notes $ 460.0   460.0      
Unamortized debt issuance cost $ (5.8)          
Carrying amount of liability component       $ 358.1    
Carrying amount of equity component       $ 101.9    
Convertible Debt | 1.75% Senior Convertible Notes            
Debt Instrument [Line Items]            
Interest rate on senior convertible notes 1.75% 1.75%        
Principal amount of notes $ 225.0   $ 0.0      
Unamortized debt issuance cost $ (1.8)          
Carrying amount of liability component   $ 190.1        
Carrying amount of equity component   $ 34.9