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Revenue
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue
The following tables represent a disaggregation of revenue by timing of revenue along with the reportable segment for each category:
 
Year Ended December 31, 2019
 
D&S East
 
D&S West
 
E&C Cryogenics
 
E&C FinFans
 
Intersegment Eliminations
 
Consolidated
Point in time
$
272.2

 
$
415.1

 
$
0.3

 
$
87.9

 
$
(6.8
)
 
$
768.7

Over time
21.2

 
46.6

 
189.9

 
273.8

 
(1.1
)
 
530.4

Total
$
293.4

 
$
461.7

 
$
190.2

 
$
361.7

 
$
(7.9
)
 
$
1,299.1


 
Year Ended December 31, 2018
 
D&S East
 
D&S West
 
E&C Cryogenics
 
E&C FinFans
 
Intersegment Eliminations
 
Consolidated
Point in time
$
222.9

 
$
405.3

 
$
1.0

 
$
135.2

 
$
(6.2
)
 
$
758.2

Over time
23.4

 
50.2

 
135.9

 
118.4

 
(1.8
)
 
326.1

Total
$
246.3

 
$
455.5

 
$
136.9

 
$
253.6

 
$
(8.0
)
 
$
1,084.3


Refer to Note 4, “Segment and Geographic Information,” for a table of revenue disaggregated by product application along with the reportable segment for each category.
Contract Balances
The following table represents changes in our contract assets and contract liabilities balances:
 
December 31, 2019
 
January 1, 2019
 
Year-to-date Change ($)
 
Year-to-date Change (%)
Contract assets
 
 
 
 
 
 
 
Accounts receivable, net of allowances
$
202.6

 
$
194.8

 
$
7.8

 
4.0
 %
Unbilled contract revenue
86.1

 
54.5

 
31.6

 
58.0
 %
 
 
 
 
 
 
 
 
Contract liabilities
 
 
 
 
 
 
 
Customer advances and billings in excess of contract revenue
$
127.8

 
$
130.0

 
$
(2.2
)
 
(1.7
)%
Long-term deferred revenue
0.8

 
1.4

 
(0.6
)
 
(42.9
)%

Revenue recognized for the years ended December 31, 2019 and 2018, that was included in the contract liabilities balance at the beginning of each year was $113.2 and $83.7, respectively. The amount of revenue recognized during the year ended December 31, 2019 from performance obligations satisfied or partially satisfied in previous periods as a result of changes in the estimates of variable consideration related to long-term contracts, was not significant.
Remaining Performance Obligations
Remaining performance obligations represent the transaction price of firm signed purchase orders or other written contractual commitments from customers for which work has not been performed, or is partially completed, and excludes unexercised contract options and potential orders.  As of December 31, 2019, the estimated revenue expected to be recognized in the future related to remaining performance obligations was $762.3. We expect to recognize revenue on approximately 83.4% of the remaining performance obligations over the next 12 months and 10% of the remaining performance obligations over the next 13 to 24 months, with the remaining balance recognized thereafter.