Revisions in Estimates (Tables)

9 Months Ended

Sep. 30, 2011

Large Project Construction [Member]

Change in Accounting Estimate [Line Items]

Schedule of Change in Accounting Estimate

Increases

		Three Months Ended September 30,				Nine Months Ended September 30,
(dollars in millions)		2011		2010		2011		2010
Number of projects with upward estimate changes		5		2		6		6
Range of increase in gross profit from each project, net	$	1.0 - 2.6	$	1.4 - 2.8	$	1.4 - 4.2	$	1.0 - 4.2
Increase on project profitability	$	8.8	$	4.2	$	17.7	$	11.6

Decreases

		Three Months Ended September 30,				Nine Months Ended September 30,
(dollars in millions)		2011		September 30, 2010		2011		September 30, 2010
Number of projects with downward estimate changes		3		2		2		2
Range of reduction in gross profit from each project, net	$	1.7 - 2.4	$	1.9 - 2.4	$	4.2 - 5.6	$	2.2 - 2.9
Decrease on project profitability	$	6.1	$	4.3	$	9.8	$	5.1

Construction [Member]

Change in Accounting Estimate [Line Items]

Schedule of Change in Accounting Estimate

Increases

		Three Months Ended September 30,				Nine Months Ended September 30,
(dollars in millions)		2011		2010		2011		2010
Number of projects with upward estimate changes		2		2		4		3
Range of increase in gross profit from each project, net	$	1.3 - 1.4	$	2.2 - 2.9	$	1.1 - 2.9	$	1.0 - 2.9
Increase on project profitability	$	2.7	$	5.1	$	7.0	$	6.5

Decreases

		Three Months Ended September 30,				Nine Months Ended September 30,
(dollars in millions)		2011		2010		2011		2010
Number of projects with downward estimate changes		2		2		3		3
Range of reduction in gross profit from each project, net	$	1.4 - 2.6	$	2.2 - 2.2	$	1.4 - 2.6	$	1.9 - 2.7
Decrease on project profitability	$	4.0	$	4.4	$	5.4	$	6.9