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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 90.4	$ 107.1	$ 283.7	$ 344.0
Top five countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 65.5	$ 78.7	$ 214.4	$ 258.8
Top five countries | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	72.50%	73.60%	75.50%	75.20%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 49.4	$ 58.0	$ 159.3	$ 182.4
United States | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	54.70%	54.10%	56.10%	52.90%
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 5.4	$ 7.9	$ 18.5	$ 28.5
United Kingdom | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	6.00%	7.40%	6.50%	8.30%
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 5.0	$ 3.5	$ 14.1	$ 12.9
France | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.50%	3.30%	5.00%	3.80%
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 2.6	$ 5.1	$ 11.4	$ 16.8
Italy | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	2.90%	4.80%	4.00%	4.90%
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 3.1	$ 4.2	$ 11.1	$ 18.2
Germany | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	3.40%	3.90%	3.90%	5.30%
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 5.9	$ 8.6	$ 18.3	$ 30.5
Rest of Europe | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	6.50%	8.00%	6.50%	8.90%
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 12.5	$ 13.0	$ 34.5	$ 37.3
Asia Pacific | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	13.80%	12.10%	12.20%	10.80%
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 6.5	$ 6.8	$ 16.5	$ 17.4
Other | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	7.20%	6.30%	5.80%	5.10%

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