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Agreement with SK hynix (Details 4) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2015
Dec. 09, 2013
Jun. 11, 2013
Micron              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Cash Received $ 40.0 $ 40.0 $ 40.0 $ 5.5      
Estimated to Be Received in 2017 40.0            
Estimated to Be Received in 2018 40.0            
Estimated to Be Received in 2019 40.0            
Estimated to Be Received in 2020 34.5            
Total Estimated Cash receipts 280.0         $ 280.0  
Micron | Royalty revenue              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Cash Received 39.5 38.7 38.7 5.3      
Estimated to Be Received in 2017 40.0            
Estimated to Be Received in 2018 40.0            
Estimated to Be Received in 2019 40.0            
Estimated to Be Received in 2020 34.5            
Total Estimated Cash receipts 276.7         $ 276.7  
Micron | Gain from settlement              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Cash Received 0.5 1.3 1.3 0.2      
Estimated to Be Received in 2017 0.0            
Estimated to Be Received in 2018 0.0            
Estimated to Be Received in 2019 0.0            
Estimated to Be Received in 2020 0.0            
Total Estimated Cash receipts 3.3            
SK hynix              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Cash Received 64.0 56.0 48.0 24.0      
Estimated to Be Received in 2017 48.0            
Estimated to Be Received in 2018 40.0            
Estimated to Be Received in 2019 32.0            
Estimated to Be Received in 2020 48.0            
Estimated to Be Received in 2021 and thereafter 168.0            
Total Estimated Cash receipts 528.0       $ 528.0   $ 240.0
SK hynix | Royalty revenue              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Cash Received 63.9 55.3 47.3 23.6      
Estimated to Be Received in 2017 48.0            
Estimated to Be Received in 2018 40.0            
Estimated to Be Received in 2019 32.0            
Estimated to Be Received in 2020 48.0            
Estimated to Be Received in 2021 and thereafter 168.0            
Total Estimated Cash receipts 526.1       $ 526.1    
SK hynix | Gain from settlement              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Cash Received 0.1 $ 0.7 $ 0.7 $ 0.4      
Estimated to Be Received in 2017 0.0            
Estimated to Be Received in 2018 0.0            
Estimated to Be Received in 2019 0.0            
Estimated to Be Received in 2020 0.0            
Estimated to Be Received in 2021 and thereafter 0.0            
Total Estimated Cash receipts $ 1.9