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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%