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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 | 21 Months Ended | 24 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 01, 2020 | Mar. 31, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Mar. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Income before income taxes |  |  | $ 30.5 | $ 19.9 | $ 24.6 |  |
Provision for income taxes at the U.K. statutory tax rate (2018: 19%, 2017:19.25%, 2016: 20.0%) |  |  | 5.8 | 3.8 | 4.9 |  |
Effect of: |  |  |  |  |  |  |
Non-deductible expenses |  |  | 0.1 | 0.8 | 0.4 |  |
Movement in valuation allowances |  |  | 0.0 | (0.9) | 0.7 |  |
Differences in income tax rates in countries where the Company operates |  |  | 0.3 | 2.2 | (0.5) |  |
Effect of U.S. tax reform |  |  | 0.0 | (4.0) | 0.0 |  |
Effect of changes in tax rates (excluding U.S. tax reform) |  |  | 0.2 | 1.1 | 0.0 |  |
Movement in uncertain tax positions |  |  | 0.1 | 0.9 | 0.9 |  |
Other |  |  | (1.0) | (0.6) | 0.4 |  |
Total provision for income taxes |  |  | $ 5.5 | $ 3.3 | $ 6.8 |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
U.K. statutory tax rate |  | 21.00% |  |  |  | 19.25% | 20.00%
Scenario, Forecast |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
U.K. statutory tax rate | 17.00% |  |  |  |  |  |

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