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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 101.5		$ 101.5		$ 106.9
Net sales	107.1	$ 129.1	344.0	$ 377.0
Top five countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	78.7	101.7	258.8	293.4
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	58.2		58.2		66.1
Net sales	58.0	67.2	182.4	195.4
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	38.3		38.3		36.0
Net sales	7.9	13.1	28.5	36.5
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	4.2	10.6	18.2	31.6
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	5.1	6.9	16.8	17.0
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	3.5	3.9	12.9	12.9
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	1.0		1.0		1.1
Net sales	8.6	7.7	30.5	25.1
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	0.3		0.3		0.3
Net sales	13.0	14.3	37.3	40.7
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	3.7		3.7		$ 3.4
Net sales	$ 6.8	$ 5.4	$ 17.4	$ 17.8
Geographic Concentration Risk | Revenue from Contract with Customer | Top five countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	73.60%	78.80%	75.20%	77.80%
Geographic Concentration Risk | Revenue from Contract with Customer | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	54.10%	52.10%	52.90%	51.80%
Geographic Concentration Risk | Revenue from Contract with Customer | United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	7.40%	10.10%	8.30%	9.70%
Geographic Concentration Risk | Revenue from Contract with Customer | Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	3.90%	8.20%	5.30%	8.40%
Geographic Concentration Risk | Revenue from Contract with Customer | Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	4.80%	5.30%	4.90%	4.50%
Geographic Concentration Risk | Revenue from Contract with Customer | France
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	3.30%	3.00%	3.80%	3.40%
Geographic Concentration Risk | Revenue from Contract with Customer | Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	8.00%	6.00%	8.90%	6.70%
Geographic Concentration Risk | Revenue from Contract with Customer | Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	12.10%	11.10%	10.80%	10.80%
Geographic Concentration Risk | Revenue from Contract with Customer | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	6.30%	4.20%	5.10%	4.70%

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