Revisions in Estimates (Tables)

6 Months Ended

Jun. 30, 2012

Construction [Member]

Change in Accounting Estimate [Line Items]

Schedule of Change in Accounting Estimate

Decreases

		Three Months Ended June 30,				Six Months Ended June 30,
(dollars in millions)		2012		2011		2012		2011
Number of projects with downward estimate changes		2		—		2		—
Range of reduction in gross profit from each project, net	$	1.1 - 1.9	$	—	$	1.4 - 4.8	$	—
Decrease on project profitability	$	3.0	$	—	$	6.2	$	—

Increases

		Three Months Ended June 30,				Six Months Ended June 30,
(dollars in millions)		2012		2011		2012		2011
Number of projects with upward estimate changes		1		1		3		2
Range of increase in gross profit from each project, net	$	1.4	$	1.4	$	1.1 - 3.2	$	1.4 - 1.5
Increase on project profitability	$	1.4	$	1.4	$	5.4	$	2.9

Large Project Construction [Member]

Change in Accounting Estimate [Line Items]

Schedule of Change in Accounting Estimate

Decreases

		Three Months Ended June 30,				Six Months Ended June 30,
(dollars in millions)		2012		2011		2012		2011
Number of projects with downward estimate changes		1		1		2		2
Range of reduction in gross profit from each project, net	$	5.6	$	1.6	$	1.5 - 7.9	$	2.6 - 3.2
Decrease on project profitability	$	5.6	$	1.6	$	9.4	$	5.8

Increases

		Three Months Ended June 30,				Six Months Ended June 30,
(dollars in millions)		2012		2011		2012		2011
Number of projects with upward estimate changes		6		1		6		4
Range of increase in gross profit from each project, net	$	1.2 - 3.6	$	1.3	$	1.4 - 5.2	$	1.0 - 4.2
Increase on project profitability	$	14.9	$	1.3	$	23.1	$	11.0