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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 99.5	$ 107.1	$ 116.5	$ 120.4	$ 110.9	$ 129.1	$ 128.2	$ 119.7	$ 443.5	$ 487.9	$ 441.3
Property, plant and equipment, net	98.9				106.9				98.9	106.9	129.1
Top five countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									336.0	379.1	336.3
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									239.4	249.2	224.1
Property, plant and equipment, net	57.3				66.1				57.3	66.1	75.4
U.K.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									35.5	47.6	40.4
Property, plant and equipment, net	36.7				36.0				36.7	36.0	36.6
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									22.0	42.0	36.8
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									22.6	23.3	19.0
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									16.5	17.0	16.0
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									38.4	33.2	31.1
Property, plant and equipment, net	1.0				1.1				1.0	1.1	13.1
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									47.6	53.0	47.5
Property, plant and equipment, net	0.3				0.3				0.3	0.3	0.2
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									21.5	22.6	26.4
Property, plant and equipment, net	$ 3.6				$ 3.4				$ 3.6	$ 3.4	$ 3.8
Geographic Concentration Risk | Revenue from Contract with Customer | Top five countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									75.80%	77.70%	76.20%
Geographic Concentration Risk | Revenue from Contract with Customer | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									54.00%	51.10%	50.80%
Geographic Concentration Risk | Revenue from Contract with Customer | U.K.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									8.00%	9.80%	9.20%
Geographic Concentration Risk | Revenue from Contract with Customer | Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									5.00%	8.60%	8.30%
Geographic Concentration Risk | Revenue from Contract with Customer | Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									5.10%	4.80%	4.30%
Geographic Concentration Risk | Revenue from Contract with Customer | France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									3.70%	3.40%	3.60%
Geographic Concentration Risk | Revenue from Contract with Customer | Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									8.70%	6.80%	7.00%
Geographic Concentration Risk | Revenue from Contract with Customer | Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									10.70%	10.90%	10.80%
Geographic Concentration Risk | Revenue from Contract with Customer | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									4.80%	4.60%	6.00%

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