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Organization and Summary of Accounting Policies - CARES ACT (Details) - USD ($)
$ in Millions
 12 Months Ended 21 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Proceeds from grants received $ 27.0     $ 86.0
Grant funds 37.9 $ 46.2 $ 0.0  
Accelerated payments   120.0    
Repayments of grants received 60.0      
Current deferred accelerated payments 60.0 95.0   60.0
Long-term deferred accelerated payments 0.0     0.0
Current deferred accrued payroll and benefits 8.5 $ 16.9   8.5
Long-term deferred accrued payroll and benefits $ 0.0     $ 0.0