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Supplementary balance sheet information (Tables) | 9 Months Ended
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Sep. 27, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Condensed Balance Sheet | Supplementary balance sheet information
|  |  | September 27, |  | December 31, |
| In millions |  | 2020 |  | 2019 |
| Accounts and other receivables |  |  |  |  |
| Trade receivables |  | $ | 45.2 |  |  | $ | 52.4 |  |
| Related parties |  | 0.1 |  |  | 2.7 |  |
| Prepayments and accrued income |  | 6.4 |  |  | 6.7 |  |
| Derivative financial instruments |  | 0.1 |  |  | 0.3 |  |
| Deferred consideration |  | 0.5 |  |  | — |  |
| Other receivables |  | 3.6 |  |  | 4.2 |  |
| Total accounts and other receivables |  | $ | 55.9 |  |  | $ | 66.3 |  |
| Inventories |  |  |  |  |
| Raw materials and supplies |  | $ | 30.0 |  |  | $ | 33.4 |  |
| Work-in-process |  | 26.4 |  |  | 32.2 |  |
| Finished goods |  | 28.3 |  |  | 28.9 |  |
| Total inventories |  | $ | 84.7 |  |  | $ | 94.5 |  |
| Other current assets |  |  |  |  |
| Held-for-sale assets |  | $ | 3.7 |  |  | $ | 3.9 |  |
| Income tax receivable |  | 0.6 |  |  | 1.1 |  |
| Total other current assets |  | $ | 4.3 |  |  | $ | 5.0 |  |
| Property, plant and equipment, net |  |  |  |  |
| Land, buildings and leasehold improvements |  | $ | 70.3 |  |  | $ | 68.1 |  |
| Machinery and equipment |  | 285.5 |  |  | 287.7 |  |
| Construction in progress |  | 6.9 |  |  | 8.9 |  |
| Total property, plant and equipment |  | 362.7 |  |  | 364.7 |  |
| Accumulated depreciation and impairment |  | (270.4) |  |  | (265.8) |  |
| Total property, plant and equipment, net |  | $ | 92.3 |  |  | $ | 98.9 |  |
| Other current liabilities |  |  |  |  |
| Contingent liabilities |  | $ | 9.5 |  |  | $ | 6.6 |  |
| Derivative financial instruments |  | 0.1 |  |  | — |  |
| Operating lease liability |  | 3.0 |  |  | 3.3 |  |
| Other current liabilities |  | 1.7 |  |  | 2.4 |  |
| Total other current liabilities |  | $ | 14.3 |  |  | $ | 12.3 |  |
| Other non-current liabilities |  |  |  |  |
| Contingent liabilities |  | $ | 1.0 |  |  | $ | 0.9 |  |
| Operating lease liability |  | 9.5 |  |  | 11.7 |  |
| Other non-current liabilities |  | 0.1 |  |  | 0.2 |  |
| Total other non-current liabilities |  | $ | 10.6 |  |  | $ | 12.8 |  |
Schedule of Current Held-for-Sale Assets and Liabilities | Held-for-sale assets and liabilities
| Held-for-sale assets | September 27, |  | December 31, |
| In millions | 2020 |  | 2019 |
| Property, plant and equipment | $ | 3.7 |  |  | $ | 3.7 |  |
| Inventory | — |  |  | 0.2 |  |
| Held-for-sale assets | $ | 3.7 |  |  | $ | 3.9 |  |

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- Definition Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109226691&loc=SL51724579-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1474-107760 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5D -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721677-107760 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721533-107759 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721659-107760 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721665-107760 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721671-107760 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721663-107760 + Details
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