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Organization and Summary of Accounting Policies - CARES ACT (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended 15 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]            
Proceeds from grants received $ 1.0   $ 8.0     $ 67.0
Repayments of grants received     20.0      
Grant funds 4.9 $ 43.1 20.0 $ 43.1    
Accelerated payments         $ 120.0  
Deferred accelerated payments 76.0   76.0   95.0 76.0
Deferred accrued payroll and benefits $ 16.9   $ 16.9   $ 16.9 $ 16.9