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Revenue Recognition - Service or Extended Maintenance Agreements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]    
Unearned revenue associated with outstanding contracts $ 2.4 $ 3.0
Revenue recognized 2.2  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01    
Disaggregation of Revenue [Line Items]    
Unearned revenue $ 2.0  
Expected timing of satisfaction 12 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01    
Disaggregation of Revenue [Line Items]    
Unearned revenue $ 0.4  
Expected timing of satisfaction 12 months