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Segment Reporting and Geographical Area Data - Segment Reporting on Basis of Geographical Location (Detail) - USD ($) $ in Millions | 12 Months Ended
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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)

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