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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 1,306.8 $ 883.4 $ 1,012.3
Income before income taxes 128.1 103.1 152.3
Long-lived assets at year end 359.2 409.2 246.1
Goodwill 361.8 374.8 267.4
Identifiable assets at year end 1,410.2 1,181.4 1,028.6
United States & North America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 615.7 474.4 571.9
Income before income taxes 11.5 16.8 52.7
Long-lived assets at year end 149.7 155.3 185.8
Identifiable assets at year end 452.2 377.3 410.9
United Kingdom [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 730.9 428.2 445.2
Income before income taxes 51.9 42.6 60.6
Long-lived assets at year end 45.7 45.9 49.3
Identifiable assets at year end 258.4 257.6 303.4
Rest of Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 143.4 118.5 133.3
Income before income taxes 63.1 39.2 42.0
Long-lived assets at year end 163.5 207.5 10.6
Identifiable assets at year end 317.5 156.0 30.9
Rest of World [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 39.2 31.1 22.1
Income before income taxes 1.6 4.5 (3.0)
Long-lived assets at year end 0.3 0.5 0.4
Identifiable assets at year end 20.3 15.7 16.0
Sales Between Areas [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ (222.4) $ (168.8) $ (160.2)