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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 107.8		$ 106.9
Net sales	120.4	$ 119.7
Top five countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	92.8	95.5
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	65.1		66.1
Net sales	61.4	62.3
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	37.8		36.0
Net sales	11.5	11.6
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	8.2	11.4
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	6.5	5.3
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	5.2	4.9
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	1.0		1.1
Net sales	11.8	7.6
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	0.3		0.3
Net sales	11.6	10.6
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	3.6		$ 3.4
Net sales	$ 4.2	$ 6.0
Geographic Concentration Risk | Revenue from Contract with Customer | Top five countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	77.10%	79.80%
Geographic Concentration Risk | Revenue from Contract with Customer | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	51.00%	52.00%
Geographic Concentration Risk | Revenue from Contract with Customer | United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	9.60%	9.70%
Geographic Concentration Risk | Revenue from Contract with Customer | Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	6.80%	9.50%
Geographic Concentration Risk | Revenue from Contract with Customer | Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.40%	4.40%
Geographic Concentration Risk | Revenue from Contract with Customer | France
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	4.30%	4.10%
Geographic Concentration Risk | Revenue from Contract with Customer | Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	9.80%	6.30%
Geographic Concentration Risk | Revenue from Contract with Customer | Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	9.60%	8.90%
Geographic Concentration Risk | Revenue from Contract with Customer | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	3.50%	5.00%

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