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Income Taxes - Loss Carryforwards (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Research and experimentation tax credit carryforward  
Operating Loss Carryforwards [Line Items]  
Tax credit carryforward amount $ 30.4
Orphan drug tax credit carryforwards  
Operating Loss Carryforwards [Line Items]  
Tax credit carryforward amount 141.8
Federal  
Operating Loss Carryforwards [Line Items]  
Amount of net operating loss carry forwards 1,156.0
State  
Operating Loss Carryforwards [Line Items]  
Amount of net operating loss carry forwards $ 889.4