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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 110.9	$ 129.1	$ 128.2	$ 119.7	$ 116.1	$ 115.2	$ 106.6	$ 103.4	$ 487.9	$ 441.3	$ 414.8
Property, plant and equipment, net	106.9				129.1				106.9	129.1	128.6
Top five countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									379.1	336.3	314.6
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									249.2	224.1	211.3
Property, plant and equipment, net	66.1				75.4				66.1	75.4	77.5
U.K.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									47.6	40.4	36.5
Property, plant and equipment, net	36.0				36.6				36.0	36.6	34.3
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									42.0	36.8	32.2
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									23.3	19.0	19.6
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									17.0	16.0	15.0
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									33.2	31.1	27.4
Property, plant and equipment, net	1.1				13.1				1.1	13.1	12.8
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									53.0	47.5	45.6
Property, plant and equipment, net	0.3				0.2				0.3	0.2	0.2
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									22.6	26.4	27.2
Property, plant and equipment, net	$ 3.4				$ 3.8				$ 3.4	$ 3.8	$ 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									77.70%	76.20%	75.80%
Geographic Concentration Risk | Revenue from Contract with Customer | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									51.10%	50.80%	50.90%
Geographic Concentration Risk | Revenue from Contract with Customer | U.K.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									9.80%	9.20%	8.80%
Geographic Concentration Risk | Revenue from Contract with Customer | Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									8.60%	8.30%	7.80%
Geographic Concentration Risk | Revenue from Contract with Customer | Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									4.80%	4.30%	4.70%
Geographic Concentration Risk | Revenue from Contract with Customer | France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									3.40%	3.60%	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									6.80%	7.00%	6.60%
Geographic Concentration Risk | Revenue from Contract with Customer | Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									10.90%	10.80%	11.00%
Geographic Concentration Risk | Revenue from Contract with Customer | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									4.60%	6.00%	6.60%

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