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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 1,513.3 $ 1,476.9 $ 1,306.8
Income before income taxes 150.4 131.6 128.1
Long-lived assets at year end 343.3 332.7 359.2
Goodwill 363.0 364.9 361.8
Identifiable assets at year end 1,468.8 1,473.4 1,410.2
United States & North America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 897.2 803.1 615.7
Income before income taxes 53.9 37.1 11.5
Long-lived assets at year end 156.0 148.6 149.7
Identifiable assets at year end 419.5 402.5 452.2
United Kingdom [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 810.9 797.5 730.9
Income before income taxes 67.0 59.5 51.9
Long-lived assets at year end 70.4 71.6 45.7
Identifiable assets at year end 487.2 504.7 258.4
Rest of Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 115.7 143.7 143.4
Income before income taxes 27.2 32.8 63.1
Long-lived assets at year end 116.6 112.2 163.5
Identifiable assets at year end 163.2 173.1 317.5
Rest of World [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 47.8 29.5 39.2
Income before income taxes 2.3 2.2 1.6
Long-lived assets at year end 0.3 0.3 0.3
Identifiable assets at year end 35.9 28.2 20.3
Sales Between Areas [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ (358.3) $ (296.9) $ (222.4)