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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 89.5	$ 116.5	$ 193.3	$ 236.9
Top five countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 69.2	$ 87.3	$ 148.9	$ 180.1
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	77.30%	74.90%	77.00%	76.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 50.2	$ 63.0	$ 109.9	$ 124.4
United States | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	56.10%	54.00%	56.80%	52.50%
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 5.7	$ 9.1	$ 13.1	$ 20.6
United Kingdom | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	6.40%	7.80%	6.80%	8.70%
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 4.4	$ 5.8	$ 8.0	$ 14.0
Germany | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	4.90%	5.00%	4.10%	5.90%
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 4.4	$ 5.2	$ 8.8	$ 11.7
Italy | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	4.90%	4.50%	4.60%	4.90%
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 4.5	$ 4.2	$ 9.1	$ 9.4
France | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.00%	3.60%	4.70%	4.00%
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 5.3	$ 10.1	$ 12.4	$ 21.9
France | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.90%	8.70%	6.40%	9.20%
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 10.5	$ 12.7	$ 22.0	$ 24.3
Asia Pacific | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	11.80%	10.90%	11.40%	10.30%
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 4.5	$ 6.4	$ 10.0	$ 10.6
Other | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.00%	5.50%	5.20%	4.50%

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