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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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