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Organization and Summary of Accounting Policies - Medicare Accelerated Payments and Deferred Governmental Grants (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Proceeds from grants received $ 1.0   $ 1.0 $ 8.0  
Grant funds (0.1) $ (4.9) (1.3) $ (20.0)  
Unrecognized grant funds received 4.0   4.0   $ 4.0
Repayments of grants received 25.0   43.0    
Deferred accelerated payments $ 17.0   $ 17.0   $ 60.0