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Segmental Information - Geographic Information by Region (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net $ 63.1 $ 63.8
U.S.    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net 26.8 26.8
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net 32.0 32.8
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net 3.0 2.9
Rest of Europe    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net 1.0 1.0
Asia Pacific    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net $ 0.3 $ 0.3