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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | $ 883.4 | $ 1,012.3 | $ 960.9
Income before income taxes | 103.1 | 152.3 | 110.9
Long-lived assets at year end | 409.2 | 246.1 | 263.0
Goodwill | 374.8 | 267.4 | 276.1
Identifiable assets at year end | 1,181.4 | 1,028.6 | 999.9
United States [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 474.4 | 571.9 | 468.6
Income before income taxes | 16.8 | 52.7 | 15.2
Long-lived assets at year end | 155.3 | 185.8 | 197.9
Identifiable assets at year end | 377.3 | 410.9 | 449.3
United Kingdom [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 428.2 | 445.2 | 486.1
Income before income taxes | 42.6 | 60.6 | 57.8
Long-lived assets at year end | 45.9 | 49.3 | 54.1
Identifiable assets at year end | 257.6 | 303.4 | 216.4
Rest of Europe [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 118.5 | 133.3 | 146.9
Income before income taxes | 39.2 | 42.0 | 39.3
Long-lived assets at year end | 207.5 | 10.6 | 10.4
Identifiable assets at year end | 156.0 | 30.9 | 39.0
Rest of World [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 31.1 | 22.1 | 21.4
Income before income taxes | 4.5 | (3.0) | (1.4)
Long-lived assets at year end | 0.5 | 0.4 | 0.6
Identifiable assets at year end | 15.7 | 16.0 | 19.1
Sales Between Areas [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | $ (168.8) | $ (160.2) | $ (162.1)

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