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Revisions in Estimates (Tables)
 9 Months Ended
Sep. 30, 2018
Transportation [Member]  
Change In Accounting Estimate [Line Items]  
Schedule of Projects Summarized

The projects are summarized as follows:

 

 

 

Three Months Ended

September 30,

 

 

 

Nine Months Ended

September 30,

 

(dollars in millions)

 

2018

 

 

 

2017

 

 

 

2018

 

 

 

2017

 

Number of projects with downward estimate changes

 

 

2

 

 

 

 

1

 

 

 

 

4

 

 

 

 

6

 

Range of reduction in gross profit from each project, net

$

7.3 - 12.0

 

 

$

 

12.7

 

 

$

5.2 - 25.6

 

 

$

5.1 - 14.5

 

Decrease to project profitability

$

 

19.3

 

 

$

 

12.7

 

 

$

 

57.8

 

 

$

 

56.8