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Disclosure of the effect on gross profit of the current period when a change in accounting estimate affects several future periods.

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Number of Projects with Estimate Changes

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Amount of each individual error being corrected in the correcting adjustment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 1.N)
-URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693

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Revisions in Estimates (Details) $ in Millions	3 Months Ended
Revisions in Estimates (Details) $ in Millions	Mar. 31, 2017 USD ($) project	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($) project
Change in Accounting Estimates
Impact From Affirmative Claim Recovery Estimate	$ 1.8		$ 2.8
Impact From Estimated Recovery of Backcharge Claims	(0.3)		0.0
Construction Segment
Change in Accounting Estimates
Change in Accounting Estimate Amount Considered Significant to Individual Project Gross Profit	1.0		1.0
Downward Estimate Changes \| Construction Segment \| Minimum
Change in Accounting Estimates
Range Of Effect On Gross Profit	0.0		0.0
Downward Estimate Changes \| Construction Segment \| Maximum
Change in Accounting Estimates
Range Of Effect On Gross Profit	$ 0.0		$ 0.0
Downward Estimate Changes \| Large Project Construction Segment
Change in Accounting Estimates
Number of Projects with Estimate Changes \| project	5		2
Increase (Decrease) on Project Profitability	$ (13.0)		$ (5.2)
Downward Estimate Changes \| Large Project Construction Segment \| Minimum
Change in Accounting Estimates
Range Of Effect On Gross Profit	(1.3)		(2.1)
Downward Estimate Changes \| Large Project Construction Segment \| Maximum
Change in Accounting Estimates
Range Of Effect On Gross Profit	(4.7)		$ (3.1)
Upward Estimate Changes \| Construction Segment
Change in Accounting Estimates
Number of Projects with Estimate Changes \| project			1
Upward Estimate Changes \| Construction Segment \| Minimum
Change in Accounting Estimates
Range Of Effect On Gross Profit	0.0		$ 1.7
Upward Estimate Changes \| Construction Segment \| Maximum
Change in Accounting Estimates
Range Of Effect On Gross Profit	$ 0.0		$ 1.7
Upward Estimate Changes \| Large Project Construction Segment
Change in Accounting Estimates
Number of Projects with Estimate Changes \| project	0		2
Increase (Decrease) on Project Profitability	$ 0.0		$ 2.4
Upward Estimate Changes \| Large Project Construction Segment \| Minimum
Change in Accounting Estimates
Range Of Effect On Gross Profit	0.0		1.0
Upward Estimate Changes \| Large Project Construction Segment \| Maximum
Change in Accounting Estimates
Range Of Effect On Gross Profit	0.0		1.4
Net Upward Estimate Changes \| Construction Segment
Change in Accounting Estimates
Increase (Decrease) on Project Profitability			1.7
Net Upward Estimate Changes \| Large Project Construction Segment
Change in Accounting Estimates
Increase (Decrease) on Project Profitability	(13.0)		(2.8)
Contracts Accounted for under Percentage of Completion [Member] \| Large Project Construction Segment \| Noncontrolling Interest [Member]
Change in Accounting Estimates
Increase (Decrease) on Project Profitability	(1.6)		0.0
Estimated costs recorded in prior period
Change in Accounting Estimates
Impact From Affirmative Claim Recovery Estimate	(0.9)		1.7
Revisions to estimated total contract costs
Change in Accounting Estimates
Impact From Affirmative Claim Recovery Estimate	$ 2.7		$ 1.1
Sales Revenue, Net
Change in Accounting Estimates
Misstatement in prior period filing		$ 4.9
Gross Profit
Change in Accounting Estimates
Misstatement in prior period filing		$ 1.6