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Net sales (Tables) | 3 Months Ended
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Mar. 28, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | Disaggregated sales disclosures for the quarter ended March 28, 2021, and March 29, 2020, are included below and in Note 14, Segmental Information.
|  | First Quarter |
|  | 2021 |  | 2020 |  |  |
| In millions | Gas Cylinders | Elektron | Total |  | Gas Cylinders | Elektron | Total |  |  |  |  |
| General industrial | $ | 5.8 |  | $ | 21.7 |  | $ | 27.5 |  |  | $ | 6.2 |  | $ | 27.7 |  | $ | 33.9 |  |  |  |  |  |
| Transportation | 14.9 |  | 11.8 |  | 26.7 |  |  | 12.9 |  | 11.2 |  | 24.1 |  |  |  |  |  |
| Defense, First Response & Healthcare | 15.5 |  | 15.5 |  | 31.0 |  |  | 18.1 |  | 12.3 |  | 30.4 |  |  |  |  |  |
|  | $ | 36.2 |  | $ | 49.0 |  | $ | 85.2 |  |  | $ | 37.2 |  | $ | 51.2 |  | $ | 88.4 |  |  |  |  |  |

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