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Intangible Assets and Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]          
Cost $ 4.3   $ 4.3   $ 4.3
Accumulated amortization (0.5)   (0.5)   (0.1)
Intangible assets, net 3.8   3.8   4.2
Amortization expense 0.2 $ 1.9 0.4 $ 3.8  
Amortization expense, remainder of 2016 0.3   0.3    
Amortization expense, 2017 0.7   0.7    
Amortization expense, 2018 0.7   0.7    
Amortization expense, 2019 0.7   0.7    
Amortization expense, 2020 0.7   0.7    
Goodwill 3.8   3.8   3.8
Developed Technology          
Acquired Finite-Lived Intangible Assets [Line Items]          
Cost 4.3   4.3   4.3
Accumulated amortization (0.5)   (0.5)   (0.1)
Intangible assets, net $ 3.8   $ 3.8   $ 4.2