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Revenue
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Revenue 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

 

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 2% of the Company’s revenue for the fiscal years ended December 31, 2019, and December 31, 2018, 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, 2019
 
December 31, 2018
 
 
Contract receivables
$
1.7

 
$
1.5

 
 
Contract assets
1.3

 
2.1

 
 
Contract liabilities
(0.5
)
 
(1.1
)
 

Contract assets consist of $1.3 million accrued unbilled amounts relating to tooling revenue and are recognized as prepayments and accrued income in accounts and other receivables in the consolidated balance sheets. Of the $2.1 million contract assets recognized as of December 31, 2018, $2.0 million were billed to customers and transferred to receivables as of December 31, 2019. Contract assets recognized as of December 31, 2017, of $4.6 million were all billed to customers and transferred to receivables in the fiscal year ending December 31, 2018.
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
)