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Income Taxes - Reconciliation of Income before Income Taxes and Total Provision for Income Taxes (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income before income taxes		$ 27.7	$ 16.3	$ 34.2
Provision for income taxes at the U.K. statutory tax rate (2019: 19%, 2018:19%, 2017: 19.25%)		5.3	3.1	6.6
Effect of:
Non-deductible expenses		1.7	2.7	0.1
Movement in valuation allowances		0.8	1.2	0.0
Differences in income tax rates in countries where the Company operates		(0.1)	1.1	0.5
Effect of changes in tax rates (excluding U.S. tax reform)		0.1	(0.1)	0.2
Movement in uncertain tax positions		(0.4)	0.4	0.1
Other		(0.5)	(0.8)	(1.0)
Total provision for income taxes		$ 6.9	$ 7.6	$ 6.5
U.K. statutory tax rate	17.00%

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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