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Property, Plant and Equipment (Tables) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 11.3 $ 9.1  
Property, Plant and Equipment, Additions 2.2    
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (4.3) (3.6)  
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment (0.7)    
Property, Plant And Equipment, Net Capital Expenditures 1.5    
Property, Plant and Equipment, Net 7.0 5.5  
Depreciation (0.7) (0.6) $ (0.6)
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 1.2 1.2  
Property, Plant and Equipment, Additions 0.0    
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 5.0 4.8  
Property, Plant and Equipment, Additions 0.2    
Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 3.8 2.0  
Property, Plant and Equipment, Additions 1.8    
Other Capitalized Property Plant and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 1.3 $ 1.1  
Property, Plant and Equipment, Additions $ 0.2