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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Contingency [Line Items]      
Tax credit carryforwards $ 77.1 $ 3.0  
Gross unrecognized tax benefits 66.7 9.3 $ 2.1
Gross unrecognized tax benefits that would decrease the effective tax rate if recognized 35.3    
Research Tax Credit Carryforward      
Income Tax Contingency [Line Items]      
Tax credit 79.6    
Tax credit carryforwards 77.8    
Desert Newco, LLC      
Income Tax Contingency [Line Items]      
Increase in deferred tax assets related to investment in Desert Newco 130.5 113.7  
Increase in deferred tax assets related to NOLs and credit carryforwards $ 70.0 $ 94.4