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Selected Quarterly Data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information | The following tables present 2018 and 2017 quarterly financial information:
|  |  | 2018 |
| In millions, except per-share data |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Full Year |
| Net sales |  | $ | 119.7 |  |  | $ | 128.2 |  |  | $ | 129.1 |  |  | $ | 110.9 |  |  | $ | 487.9 |  |
| Gross profit |  | 30.3 |  |  | 33.6 |  |  | 34.0 |  |  | 24.2 |  |  | 122.1 |  |
| Operating income / (loss) |  | 12.8 |  |  | 14.6 |  |  | 15.7 |  |  | (13.1 | ) |  | 30.0 |  |
| Net income / (loss) |  | 9.9 |  |  | 11.4 |  |  | 12.2 |  |  | (8.5 | ) |  | 25.0 |  |
| Earnings / (loss) per ordinary share(1) |  |  |  |  |  |  |  |  |  |  |
| Basic earnings / (loss) per ordinary share |  | $ | 0.37 |  |  | $ | 0.43 |  |  | $ | 0.46 |  |  | $ | (0.31 | ) |  | $ | 0.94 |  |
| Diluted earnings / (loss) per ordinary share |  | 0.36 |  |  | 0.42 |  |  | 0.44 |  |  | (0.31 | ) |  | 0.90 |  |
|  |  | 2017 |
| In millions, except per-share data |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Full Year |
| Net sales |  | $ | 103.4 |  |  | $ | 106.6 |  |  | $ | 115.2 |  |  | $ | 116.1 |  |  | $ | 441.3 |  |
| Gross profit |  | 25.7 |  |  | 26.3 |  |  | 29.5 |  |  | 27.1 |  |  | $ | 108.6 |  |
| Operating income / (loss) |  | 10.2 |  |  | 6.3 |  |  | 8.5 |  |  | (3.1 | ) |  | $ | 21.9 |  |
| Net income / (loss) |  | 7.9 |  |  | 3.9 |  |  | 5.8 |  |  | (1.0 | ) |  | $ | 16.6 |  |
| Earnings / (loss) per ordinary share(1) |  |  |  |  |  |  |  |  |  |  |
| Basic earnings / (loss) per ordinary share |  | $ | 0.30 |  |  | $ | 0.15 |  |  | $ | 0.22 |  |  | $ | (0.04 | ) |  | $ | 0.63 |  |
| Diluted earnings / (loss) per ordinary share |  | 0.30 |  |  | 0.15 |  |  | 0.22 |  |  | (0.04 | ) |  | 0.62 |  |
(1) | Amounts may not total to annual earnings because each quarter and year are calculated separately based on basic and diluted weighted-average ordinary shares outstanding during the period.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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