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Acquisition and disposal related gains / (costs) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 28, 2020	Mar. 29, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 28, 2020	Jun. 30, 2019
Business Combinations [Abstract]
Acquisition and disposal related gains / (costs)	$ 0.0	$ 0.2	$ 2.9	$ 4.6	$ (0.2)	$ (1.7)
Release of deferred consideration (recognized in acquisition-related costs)		$ 0.1
Acquisition related gains			$ 2.9

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- Definition

Acquisition and Disposals Related Credits (Costs)

+ References

No definition available.

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Release of Deferred Consideration

+ References

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- Definition

The revenues and gains recognized recorded for each transaction with the acquiree that is recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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