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Research Funding (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
May 31, 2017
Feb. 28, 2017
Deferred Revenue Arrangement [Line Items]              
Grants receivable $ 8.6           $ 12.2
Grants receivable, current           $ 5.7  
Revenue from grants $ 0.3 $ 1.9     $ 7.9    
Amortization of deferred credit     $ 0.6 $ 0.3 1.3    
Accrued Liabilities [Member]              
Deferred Revenue Arrangement [Line Items]              
Deferred grant revenue     2.6   2.6    
Other Long-Term Liabilities [Member]              
Deferred Revenue Arrangement [Line Items]              
Deferred grant revenue     $ 2.8   $ 2.8