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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)