Revisions in Estimates (Tables)

3 Months Ended

Mar. 31, 2016

Construction [Member]

Change in Accounting Estimate [Line Items]

Schedule of Change in Accounting Estimate

The projects are summarized as follows:

Increases

	Three Months Ended March 31,
(dollars in millions)		2016		2015
Number of projects with upward estimate changes		1		3
Range of increase in gross profit from each project, net	$	1.7	$	1.0 - 2.2
Increase on project profitability	$	1.7	$	4.8

Large Project Construction [Member]

Change in Accounting Estimate [Line Items]

Schedule of Change in Accounting Estimate

The projects are summarized as follows:

Increases

	Three Months Ended March 31,
(dollars in millions)		2016		2015
Number of projects with upward estimate changes		2		2
Range of increase in gross profit from each project, net	$	1.0 - 1.4	$	1.1 - 1.9
Increase on project profitability	$	2.4	$	3.0

Decreases

	Three Months Ended March 31,
(dollars in millions)		2016		2015
Number of projects with downward estimate changes		2		3
Range of reduction in gross profit from each project, net	$	2.1 - 3.1	$	1.1 - 1.4
Decrease on project profitability	$	5.2	$	3.8