Revisions in Estimates (Tables)

9 Months Ended

Sep. 30, 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 September 30,					Nine Months Ended September 30,
(dollars in millions)		2016		2015		2016		2015
Number of projects with upward estimate changes		1		1		2		7
Range of increase in gross profit from each project, net	$	2.6	$	5.1	$	1.8 - 2.7	$	1.0 - 5.0
Increase on project profitability	$	2.6	$	5.1	$	4.5	$	15.3

Decreases

	Three Months Ended September 30,					Nine Months Ended September 30,
(dollars in millions)		2016		2015		2016		2015
Number of projects with downward estimate changes		1		1		5		3
Range of reduction in gross profit from each project, net	$	1.9	$	1.4	$	1.1 - 2.6	$	1.5 - 2.3
Decrease on project profitability	$	1.9	$	1.4	$	7.6	$	5.9

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 September 30,					Nine Months Ended September 30,
(dollars in millions)		2016		2015		2016		2015
Number of projects with upward estimate changes		3		4		7		7
Range of increase in gross profit from each project, net	$	1.4 - 3.0	$	1.0 - 3.9	$	1.2 - 6.5	$	1.5 - 5.1
Increase on project profitability	$	6.1	$	9.4	$	19.8	$	19.9

Decreases

	Three Months Ended September 30,					Nine Months Ended September 30,
(dollars in millions)		2016		2015		2016		2015
Number of projects with downward estimate changes		3		2		4		5
Range of reduction in gross profit from each project, net	$	1.1 - 3.5	$	1.8 - 2.6	$	3.4 - 7.9	$	2.6 - 4.6
Decrease on project profitability	$	5.7	$	4.4	$	25.8	$	18.1