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Segmental Information - Property, Plant and Equipment by Geographic Region (Details) - USD ($) $ in Millions	Sep. 26, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 88.5	$ 86.0
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	47.4	44.3
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	36.3	36.6
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	3.4	3.7
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	1.1	1.1
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 0.3	$ 0.3

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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