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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 1,476.9 $ 1,306.8 $ 883.4
Income before income taxes 131.6 128.1 103.1
Long-lived assets at year end 332.7 359.2 409.2
Goodwill 364.9 361.8 374.8
Identifiable assets at year end 1,473.4 1,410.2 1,181.4
United States & North America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 803.1 615.7 474.4
Income before income taxes 37.1 11.5 16.8
Long-lived assets at year end 148.6 149.7 155.3
Identifiable assets at year end 402.5 452.2 377.3
United Kingdom [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 797.5 730.9 428.2
Income before income taxes 59.5 51.9 42.6
Long-lived assets at year end 71.6 45.7 45.9
Identifiable assets at year end 504.7 258.4 257.6
Rest of Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 143.7 143.4 118.5
Income before income taxes 32.8 63.1 39.2
Long-lived assets at year end 112.2 163.5 207.5
Identifiable assets at year end 173.1 317.5 156.0
Rest of World [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 29.5 39.2 31.1
Income before income taxes 2.2 1.6 4.5
Long-lived assets at year end 0.3 0.3 0.5
Identifiable assets at year end 28.2 20.3 15.7
Sales Between Areas [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ (296.9) $ (222.4) $ (168.8)