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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)

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