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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 | 24 Months Ended | 33 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income before income taxes |  | $ 9.8 | $ 30.5 | $ 19.9 |  |
Provision for income taxes at the U.K. statutory tax rate (2019: 19%, 2018:19%, 2017: 19.25%) |  | 1.9 | 5.8 | 3.8 |  |
Effect of: |  |  |  |  |  |
Non-deductible expenses |  | 2.7 | 0.1 | 0.8 |  |
Movement in valuation allowances |  | 1.2 | 0.0 | (0.9) |  |
Differences in income tax rates in countries where the Company operates |  | 1.0 | 0.3 | 2.2 |  |
Effect of U.S. tax reform |  | 0.0 | 0.0 | (4.0) |  |
Effect of changes in tax rates (excluding U.S. tax reform) |  | (0.1) | 0.2 | 1.1 |  |
Movement in uncertain tax positions |  | 0.4 | 0.1 | 0.9 |  |
Other |  | (0.4) | (1.0) | (0.6) |  |
Total provision for income taxes |  | $ 6.7 | $ 5.5 | $ 3.3 |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
U.K. statutory tax rate |  |  |  |  | 20.00% | 19.00%
Scenario, Forecast |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
U.K. statutory tax rate | 17.00% |  |  |  |  |

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