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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 1,483.4 $ 1,193.1 $ 1,513.3
Income before income taxes 134.4 39.7 150.4
Long-lived assets at year end 304.9 325.7 343.3
Goodwill 364.3 371.2 363.0
Identifiable assets at year end 1,570.9 1,397.4 1,468.8
United States & North America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 821.6 642.4 897.2
Income before income taxes 54.6 0.0 53.9
Long-lived assets at year end 137.3 141.0 156.0
Identifiable assets at year end 464.9 368.8 419.5
United Kingdom [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 811.9 689.1 810.9
Income before income taxes 46.1 16.9 67.0
Long-lived assets at year end 55.4 61.3 70.4
Identifiable assets at year end 533.7 455.8 487.2
Rest of Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 115.6 83.4 115.7
Income before income taxes 26.4 19.7 27.2
Long-lived assets at year end 112.0 123.2 116.6
Identifiable assets at year end 164.7 171.0 163.2
Rest of World [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 66.4 45.6 47.8
Income before income taxes 7.3 3.1 2.3
Long-lived assets at year end 0.2 0.2 0.3
Identifiable assets at year end 43.3 30.6 35.9
Sales Between Areas [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ (332.1) $ (267.4) $ (358.3)