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Revenue | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Revenue | 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 |  |
The Company’s performance obligations are satisfied over time as work progresses or at a point in time. Design and tooling arrangements are the only contracts for which revenue is recognized over time. Revenue from these sources combined accounted for less than 3% of the Company’s revenue for the fiscal years ended December 31, 2018, and December 31, 2017, respectively. All consideration from contracts with customers is included in these amounts. 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 assets consist of $2.1 million accrued unbilled amounts relating to tooling revenue and are recognized in prepayments and accrued income in the consolidated balance sheets. All contract assets recognized as of December 31, 2017, of $4.6 million were billed to customers and transferred to receivables as of December 31, 2018. Contract assets recognized as of December 31, 2016, of $3.6 million were billed to customers and transferred to receivables in the fiscal year ending December 31, 2017. 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 The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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