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Revenue
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue
The following table represents a disaggregation of revenue by timing of revenue along with the reportable segment for each category:
 
Three Months Ended September 30, 2019
 
E&C Cryogenics
 
E&C FinFans
 
D&S West
 
D&S East
 
Intersegment Eliminations
 
Consolidated
Point in time
$
1.7

 
$
20.7

 
$
101.2

 
$
64.1

 
$
(5.0
)
 
$
182.7

Over time
47.2

 
107.9

 
13.7

 
6.3

 
—

 
175.1

Total
$
48.9

 
$
128.6

 
$
114.9

 
$
70.4

 
$
(5.0
)
 
$
357.8

 
Three Months Ended September 30, 2018
 
E&C Cryogenics
 
E&C FinFans
 
D&S West
 
D&S East
 
Intersegment Eliminations
 
Consolidated
Point in time
$
2.3

 
$
16.6

 
$
102.8

 
$
55.0

 
$
(1.3
)
 
$
175.4

Over time
33.3

 
45.9

 
16.2

 
1.8

 
(0.4
)
 
96.8

Total
$
35.6

 
$
62.5

 
$
119.0

 
$
56.8

 
$
(1.7
)
 
$
272.2

 
Nine Months Ended September 30, 2019
 
E&C Cryogenics
 
E&C FinFans
 
D&S West
 
D&S East
 
Intersegment Eliminations
 
Consolidated
Point in time
$
10.8

 
$
58.6

 
$
310.5

 
$
203.0

 
$
(8.2
)
 
$
574.7

Over time
120.5

 
213.4

 
34.3

 
13.8

 
—

 
382.0

Total
$
131.3

 
$
272.0

 
$
344.8

 
$
216.8

 
$
(8.2
)
 
$
956.7

 
Nine Months Ended September 30, 2018
 
E&C Cryogenics
 
E&C FinFans
 
D&S West
 
D&S East
 
Intersegment Eliminations
 
Consolidated
Point in time
$
10.6

 
$
55.9

 
$
299.3

 
$
157.0

 
$
(4.4
)
 
$
518.4

Over time
88.0

 
134.3

 
37.9

 
17.3

 
(1.7
)
 
275.8

Total
$
98.6

 
$
190.2

 
$
337.2

 
$
174.3

 
$
(6.1
)
 
$
794.2


Refer to Note 3, “Reportable Segments,” 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:
 
September 30,
 2019
 
December 31, 2018
 
Year-to-date Change ($)
 
Year-to-date Change (%)
Contract assets
 
 
 
 
 
 
 
Accounts receivable, net of allowances
$
224.5

 
$
194.8

 
$
29.7

 
15.2
 %
Unbilled contract revenue
81.6

 
54.5

 
27.1

 
49.7
 %
 
 
 
 
 
 
 
 
Contract liabilities
 
 
 
 
 
 
 
Customer advances and billings in excess of contract revenue
$
120.5

 
$
130.0

 
$
(9.5
)
 
(7.3
)%
Long-term deferred revenue
1.0

 
1.4

 
(0.4
)
 
(28.6
)%

Revenue recognized for the three and nine months ended September 30, 2019 and 2018, that was included in the contract liabilities balance at the beginning of each year was $25.8, and $91.3 and $10.3 and $78.0, respectively. The amount of revenue recognized during the three and nine months ended September 30, 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 September 30, 2019, the estimated revenue expected to be recognized in the future related to remaining performance obligations was $755.6. We expect to recognize revenue on approximately 86% of the remaining performance obligations over the next 12 months and with the remaining over the next few years thereafter.