Revisions in Estimates (Tables)

9 Months Ended

Sep. 30, 2013

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)			2013		2012		2013		2012
Number of projects with upward estimate changes			4		1		5		4
Range of increase in gross profit from each project, net		$	1.3 - 2.7	$	1.6	$	1.1 - 3.0	$	1.0 - 3.0
Increase to project profitability		$	7.4	$	1.6	$	11.8	$	7.1

Decreases

	Three Months Ended September 30,						Nine Months Ended September 30,
(dollars in millions)			2013		2012		2013		2012
Number of projects with downward estimate changes			3		4		4		6
Range of reduction in gross profit from each project, net		$	1.5 - 2.5	$	1.1 - 3.9	$	1.1 - 4.3	$	1.1 - 6.3
Decrease to project profitability		$	5.9	$	7.6	$	11.2	$	16.5

Large Project Construction [Member]

Change in Accounting Estimate [Line Items]

Schedule of Change in Accounting Estimate

Decreases

	Three Months Ended September 30,						Nine Months Ended September 30,
(dollars in millions)			2013		2012		2013		2012
Number of projects with downward estimate changes			4		—		4		2
Range of reduction in gross profit from each project, net		$	1.4 - 14.7	$	—	$	1.6 - 23.5	$	1.7 - 4.1
Decrease to project profitability		$	19.7	$	—	$	33.9	$	5.8

The projects are summarized as follows:

Increases

	Three Months Ended September 30,						Nine Months Ended September 30,
(dollars in millions)			2013		2012		2013		2012
Number of projects with upward estimate changes			3		8		6		8
Range of increase in gross profit from each project, net		$	1.0 - 10.5	$	1.1 - 12.6	$	2.1 - 26.6	$	1.1 - 16.3
Increase to project profitability		$	12.9	$	35.9	$	47.5	$	54.7