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Segment Reporting and Geographical Area Data - Segment Reporting on Basis of Geographical Location (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Jul. 31, 2025
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 1,778.0 $ 1,845.4 $ 1,948.8  
Income before income taxes 138.1 41.2 174.4  
Long-lived assets at year end 404.3 377.8    
Goodwill 399.0 382.5 399.3 $ 2.0
Identifiable assets at year end 1,832.4 1,734.7    
United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales 951.7 1,039.7 1,227.2  
Income before income taxes 25.9 90.2 95.2  
Long-lived assets at year end 132.6 156.2    
Identifiable assets at year end 555.9 593.6    
United Kingdom [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales 793.2 823.4 857.7  
Income before income taxes 67.3 (24.6) 59.1  
Long-lived assets at year end 121.3 88.0    
Identifiable assets at year end 579.1 488.2    
Rest of World [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales 379.0 288.9 199.4  
Income before income taxes 44.9 (24.4) 20.1  
Long-lived assets at year end 150.4 133.6    
Identifiable assets at year end 298.4 270.4    
Sales Between Areas [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ (345.9) $ (306.6) $ (335.5)