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Acquisitions and disposals - Net Cash Flows on Purchase of Business (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Combinations [Abstract]
Deferred consideration paid	$ (0.4)	$ (0.5)	$ (0.8)

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- Definition

Payment For Deferred Consideration, Financing Activates

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Balance Type:	na
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