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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 1,845.4 $ 1,948.8 $ 1,963.7
Income before income taxes 41.2 174.4 184.6
Long-lived assets at year end 377.8 367.6 310.2
Goodwill 382.5 399.3 358.8
Identifiable assets at year end 1,734.7 1,707.4 1,603.7
United States [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 1,039.7 1,227.2 1,204.4
Income before income taxes 90.2 95.2 106.3
Long-lived assets at year end 156.2 156.3 146.9
Identifiable assets at year end 593.6 613.7 558.4
United Kingdom [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 823.4 857.7 932.5
Income before income taxes (24.6) 59.1 43.2
Long-lived assets at year end 88.0 73.7 50.6
Identifiable assets at year end 488.2 434.9 462.3
Rest of World [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 288.9 199.4 225.1
Income before income taxes (24.4) 20.1 35.1
Long-lived assets at year end 133.6 137.6 112.7
Identifiable assets at year end 270.4 259.5 224.2
Sales Between Areas [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ (306.6) $ (335.5) $ (398.3)