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Income Taxes - Uncertain tax positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement in uncertain tax positions
Uncertain tax positions at the beginning of the period	$ 3.5	$ 3.4	$ 12.8
Gross increase - tax position in prior periods		0.2	0.2
Gross decrease - tax position in prior periods	(3.4)	(0.1)	(0.3)
Settlements			(7.8)
Foreign exchange			(1.5)
Uncertain tax positions at the end of the period	0.1	$ 3.5	$ 3.4
Interest and penalties included within uncertain tax positions	0.0
Impact of uncertain tax positions on effective tax rate, if recognized	$ 0.1

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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