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Revenue (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue by Timing
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
Changes in Contract Assets and Contract Liabilities 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
)%