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Revenue Revenue (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | Disaggregated revenue disclosures for the fiscal years ended December 31, 2018, December 31, 2017, and December 31, 2016, are included below and in Note 15, Segmental Information.
|  | Years ended December 31, |
|  | 2018 |  | 2017 |  | 2016 |
| In millions | Gas Cylinders | Elektron | Total |  | Gas Cylinders | Elektron | Total |  | Gas Cylinders | Elektron | Total |
| General industrial | $ | 50.7 |  | $ | 123.9 |  | $ | 174.6 |  |  | $ | 49.6 |  | $ | 95.6 |  | $ | 145.2 |  |  | $ | 45.7 |  | $ | 85.7 |  | $ | 131.4 |  |
| Transportation | 79.0 |  | 72.8 |  | 151.8 |  |  | 63.8 |  | 66.5 |  | 130.3 |  |  | 72.9 |  | 62.9 |  | 135.8 |  |
| Defense and emergency | 79.3 |  | 49.4 |  | 128.7 |  |  | 76.5 |  | 54.1 |  | 130.6 |  |  | 83.1 |  | 36.2 |  | 119.3 |  |
| Healthcare | 29.1 |  | 3.7 |  | 32.8 |  |  | 30.3 |  | 4.9 |  | 35.2 |  |  | 24.1 |  | 4.2 |  | 28.3 |  |
|  | $ | 238.1 |  | $ | 249.8 |  | $ | 487.9 |  |  | $ | 220.2 |  | $ | 221.1 |  | $ | 441.3 |  |  | $ | 225.8 |  | $ | 189.0 |  | $ | 414.8 |  |
Schedule of Contract Assets and Liabilities | The following table provides information about contract receivables, contract assets and contract liabilities from contracts with customers:
| In millions | December 31, 2018 |  | December 31, 2017 |
| Contract receivables | $ | 1.5 |  |  | $ | 1.6 |  |
| Contract assets | 2.1 |  |  | 4.6 |  |
| Contract liabilities | (1.1 | ) |  | (0.9 | ) |
Contract liabilities of $1.1 million consist of advance payments and billing above costs incurred and are recognized as other current liabilities. Significant changes in contract liabilities balances during the period are as follows:
| In millions | 2018 |  | 2017 |
| As at January 1, | $ | (0.9 | ) |  | $ | (0.2 | ) |
| Payments received / amounts billed | (3.8 | ) |  | (2.2 | ) |
| Costs incurred / revenue recognized | 3.6 |  |  | 1.5 |  |
| As at December 31, | $ | (1.1 | ) |  | $ | (0.9 | ) |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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