Revisions in Estimates (Tables)

12 Months Ended

Dec. 31, 2013

Construction [Member]

Change in Accounting Estimate [Line Items]

Schedule of Change in Accounting Estimate

Decreases

Years Ended December 31,		2013		2012		2011
Number of projects with downward estimate changes		5		9		4
Range of reduction in gross profit from each project, net	$	1.2 - 7.4	$	1.0 - 6.6	$	1.4 - 2.6
Decrease on project profitability	$	17.8	$	26.2	$	7.4

Increases

Years Ended December 31,		2013		2012		2011
Number of projects with upward estimate changes		6		6		7
Range of increase in gross profit from each project, net	$	1.1 - 3.7	$	1.0 - 1.7	$	1.0 - 3.5
Increase on project profitability	$	16.1	$	8.1	$	13.6

Large Project Construction [Member]

Change in Accounting Estimate [Line Items]

Schedule of Change in Accounting Estimate

Decreases

Years Ended December 31,		2013		2012		2011
Number of projects with downward estimate changes		5		1		5
Range of reduction in gross profit from each project, net	$	1.9 - 26.8	$	27.4	$	1.2 - 5.1
Decrease on project profitability	$	52.0	$	27.4	$	19.4

Increases

Years Ended December 31,		2013		2012		2011
Number of projects with upward estimate changes		7		10		9
Range of increase in gross profit from each project, net	$	2.6 - 41.3	$	1.1 - 24.5	$	1.1 - 6.9
Increase on project profitability	$	77.5	$	92.0	$	28.3