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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
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income before income taxes	$ 41.0	$ 35.4	$ 27.7
Provision for income taxes at the U.K. statutory tax rate (2022: 19%, 2021:19%, 2020: 19%)	7.8	6.7	5.3
Effect of:
Non-deductible expenses	0.7	1.9	1.7
Movement in valuation allowances	0.6	(0.6)	0.8
Differences in income tax rates in countries where the Company operates	1.5	0.5	(0.1)
Effect of changes in tax rates	(0.1)	(2.0)	0.1
Movement in uncertain tax positions	0.0	0.0	(0.4)
Other	(1.5)	(1.1)	(0.5)
Total provision for income taxes	$ 9.0	$ 5.4	$ 6.9

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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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