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Shareholders' equity - Additional Information (Details) - shares shares in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018
Shareholders Equity [Line Items] |  |  |  |
Weighted average antidilutive shares which were not included in the calculation of earnings per share |  | 1.2 |  |
Equity Option |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Weighted average antidilutive shares which were not included in the calculation of earnings per share | 0.2 | 2.0 | 0.2 | 0.7

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- Definition Shareholders equity. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Details
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