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Summary of Significant Accounting Policies - Impairment of Long-Lived Assets (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
item
Impairment of Long-Lived Assets    
Number of long-lived assets determined to be impaired | item 0 0
Assets held for sale | $ $ 0.0 $ 0.0