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Acquisitions and disposals Acquisitions and disposals (Tables) | 12 Months Ended
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Dec. 31, 2018
Business Combinations [Abstract] |
Schedule of Business Acquisitions, by Acquisition |
|  | Years ended December 31, |
| In millions | 2018 |  | 2017 |
| Net cash flows on purchase of business: |  |  |  |
| Included in net cash flows from investing activities: |  |  |  |
| Consideration paid | $ | — |  |  | $ | (4.3 | ) |
| Cash receipt on disposal of business | — |  |  | 0.1 |  |
| Acquisition and disposal costs paid | — |  |  | (0.5 | ) |
| Cash acquired | 2.7 |  |  | — |  |
| Net cash flows on purchase of business | $ | 2.7 |  |  | $ | (4.7 | ) |
|  | Years ended December 31, |
| In millions | 2018 |  | 2017 |
| Net cash flows on purchase of business: |  |  |  |
| Included in net cash flows from financing activities: |  |  |  |
| Deferred consideration paid | $ | (0.8 | ) |  | $ | (1.4 | ) |
| Net cash flows on purchase of business | $ | (0.8 | ) |  | $ | (1.4 | ) |

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- Definition Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1486-128463 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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