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Revenue (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Changes in Contract Assets and Contract Liabilities Balances
The following table represents changes in our contract assets and contract liabilities balances:
 
December 31, 2018
 
January 1, 2018
 
Year-to-date Change ($)
 
Year-to-date Change (%)
Contract assets
 
 
 
 
 
 
 
Accounts receivable, net of allowances
$
194.8

 
$
196.4

 
$
(1.6
)
 
0.8
 %
Unbilled contract revenue
54.5

 
43.0

 
11.5

 
(26.7
)%
 
 
 
 
 
 
 
 
Contract liabilities
 
 
 
 
 
 
 
Customer advances and billings in excess of contract revenue
$
130.0

 
$
101.8

 
$
28.2

 
(27.7
)%
Long-term deferred revenue
1.4

 
1.7

 
(0.3
)
 
17.6
 %
Disaggregation of Revenue by Timing
The following table represents a disaggregation of revenue by timing of revenue along with the reportable segment for each category:
 
Year Ended December 31, 2018
 
Energy & Chemicals
 
D&S West
 
D&S East
 
Intersegment Eliminations
 
Consolidated
Point in time
$
136.2

 
$
405.3

 
$
222.9

 
$
(6.2
)
 
$
758.2

Over time
254.3

 
50.2

 
23.4

 
(1.8
)
 
326.1

Total
$
390.5

 
$
455.5

 
$
246.3

 
$
(8.0
)
 
$
1,084.3