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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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