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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | Disaggregated revenue disclosures for the fiscal years ended December 31, 2019, December 31, 2018, and December 31, 2017, are included below and in Note 16, Segmental Information.
|  | Years ended December 31, |
|  | 2019 |  | 2018 |  | 2017 |
| In millions | Gas Cylinders | Elektron | Total |  | Gas Cylinders | Elektron | Total |  | Gas Cylinders | Elektron | Total |
| General industrial | $ | 46.0 |  | $ | 111.7 |  | $ | 157.7 |  |  | $ | 50.7 |  | $ | 123.9 |  | $ | 174.6 |  |  | $ | 49.6 |  | $ | 95.6 |  | $ | 145.2 |  |
| Transportation | 83.8 |  | 59.5 |  | 143.3 |  |  | 79.0 |  | 72.8 |  | 151.8 |  |  | 63.8 |  | 66.5 |  | 130.3 |  |
| Defense and emergency | 73.5 |  | 45.1 |  | 118.6 |  |  | 79.3 |  | 49.4 |  | 128.7 |  |  | 76.5 |  | 54.1 |  | 130.6 |  |
| Healthcare | 20.3 |  | 3.6 |  | 23.9 |  |  | 29.1 |  | 3.7 |  | 32.8 |  |  | 30.3 |  | 4.9 |  | 35.2 |  |
|  | $ | 223.6 |  | $ | 219.9 |  | $ | 443.5 |  |  | $ | 238.1 |  | $ | 249.8 |  | $ | 487.9 |  |  | $ | 220.2 |  | $ | 221.1 |  | $ | 441.3 |  |
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, 2019 |  | December 31, 2018 |
| Contract receivables | $ | 1.7 |  |  | $ | 1.5 |  |
| Contract assets | 1.3 |  |  | 2.1 |  |
| Contract liabilities | (0.5 | ) |  | (1.1 | ) |
Contract liabilities of $0.5 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 | 2019 |  | 2018 |
| As at January 1, | $ | (1.1 | ) |  | $ | (0.9 | ) |
| Payments received / amounts billed | (0.9 | ) |  | (3.8 | ) |
| Costs incurred / revenue recognized | 1.5 |  |  | 3.6 |  |
| As at December 31, | $ | (0.5 | ) |  | $ | (1.1 | ) |

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