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Revisions in Estimates (Tables)
 6 Months Ended
Jun. 30, 2019
Change In Accounting Estimate [Abstract]  
Summary of Impact of Revisions in Estimates on Gross Profit

The impact to gross profit is summarized as follows:

 

 

Three Months Ended June 30,

 

 

 

Six Months Ended June 30,

 

(dollars in millions)

 

2019

 

 

 

2018

 

 

 

2019

 

 

 

2018

 

Number of projects with downward estimate changes

 

 

5

 

 

 

 

2

 

 

 

 

5

 

 

 

 

3

 

Range of reduction in gross profit from each project, net

$

7.5 - 77.3

 

 

$

14.5 - 15.7

 

 

$

8.5 - 77.3

 

 

$

5.2 - 18.3

 

Decrease to project profitability

$

 

161.1

 

 

$

 

30.2

 

 

$

 

167.8

 

 

$

 

38.0