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Shareholders' equity | 9 Months Ended
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Sep. 29, 2019
Equity [Abstract] |
Shareholders' equity | Shareholders' equity Dividends paid and proposed
|  | Third Quarter |  | Year-to-date |
| In millions | 2019 |  | 2018 |  | 2019 |  | 2018 |
| Dividends declared and paid during the year: |  |  |  |  |  |  |  |
| Interim dividend paid February 7, 2018 ($0.125 per ordinary share) | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3.4 |  |
| Interim dividend paid May 2, 2018 ($0.125 per ordinary share) | — |  |  | — |  |  | — |  |  | 3.3 |  |
| Interim dividend paid August 1, 2018 ($0.125 per ordinary share) | — |  |  | 3.3 |  |  | — |  |  | 3.3 |  |
| Interim dividend paid February 6, 2019 ($0.125 per ordinary share) | — |  |  | — |  |  | 3.4 |  |  | — |  |
| Interim dividend paid May 1, 2019 ($0.125 per ordinary share) | — |  |  | — |  |  | 3.4 |  |  | — |  |
| Interim dividend paid August 7, 2019 ($0.125 per ordinary share) | 3.4 |  |  | — |  |  | 3.4 |  |  |  |
|  | $ | 3.4 |  |  | $ | 3.3 |  |  | $ | 10.2 |  |  | $ | 10.0 |  |
| In millions | 2019 |  | 2018 |
| Dividends declared after the period, (not recognized as a liability as at the period end): |  |  |  |
| Interim dividend declared October 8, and paid November 7, 2018: ($0.125 per ordinary share) | $ | — |  |  | $ | 3.3 |  |
| Interim dividend declared October 3, and to be paid November 6, 2019: ($0.125 per ordinary share) | 3.4 |  |  | — |  |
|  | $ | 3.4 |  |  | $ | 3.3 |  |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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