Summary of significant accounting policies - Receivables (Details) - ASU 2019-04 - Cumulative Effect, Adjustment $ in Millions	Jun. 28, 2020 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Allowance for credit losses	$ 17.2
Allowance for credit losses net of tax	14.5
Allowance for credit losses tax	$ 2.7

Amount of allowance for credit losses related to recorded investment net of taxes.

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- Definition

Amount of allowance for credit losses related to recorded investment tax amount.

+ References

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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