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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 94.3		$ 98.9
Net sales	103.8	$ 120.4
Top five countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	79.7	92.8
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	56.0		57.3
Net sales	59.7	61.4
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	33.7		36.7
Net sales	7.4	11.5
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	3.6	8.2
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	4.4	6.5
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	4.6	5.2
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	1.0		1.0
Net sales	7.1	11.8
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	0.3		0.3
Net sales	11.5	11.6
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	3.3		$ 3.6
Net sales	$ 5.5	$ 4.2
Geographic Concentration Risk | Revenue from Contract with Customer | Top five countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	76.80%	77.10%
Geographic Concentration Risk | Revenue from Contract with Customer | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	57.50%	51.00%
Geographic Concentration Risk | Revenue from Contract with Customer | United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	7.10%	9.60%
Geographic Concentration Risk | Revenue from Contract with Customer | Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	3.50%	6.80%
Geographic Concentration Risk | Revenue from Contract with Customer | Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	4.20%	5.40%
Geographic Concentration Risk | Revenue from Contract with Customer | France
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	4.40%	4.30%
Geographic Concentration Risk | Revenue from Contract with Customer | Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	6.80%	9.80%
Geographic Concentration Risk | Revenue from Contract with Customer | Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	11.10%	9.60%
Geographic Concentration Risk | Revenue from Contract with Customer | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.30%	3.50%

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