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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of costs and estimated earnings on uncompleted contracts
Costs and estimated earnings on uncompleted contracts, from their inception, and related amounts billed as of December 31, 2017 and 2016 were as follows:
 
2017
 
2016
Costs incurred on uncompleted contracts
$
1,261.3

 
$
1,191.4

Estimated earnings (loss) to date
(59.9
)
 
25.0

 
1,201.4

 
1,216.4

Less: Billings to date
(1,202.0
)
 
(1,235.8
)
Billings in excess of costs and estimated earnings
$
(0.6
)
 
$
(19.4
)
Schedule of net costs and estimated earnings in excess of billings
These amounts are included in the accompanying consolidated balance sheets at December 31, 2017 and 2016 as shown below. Amounts for billed retainages and receivables to be collected in excess of one year are not significant for the periods presented.
 
2017
 
2016
Costs and estimated earnings in excess of billings(1)
$
28.8

 
$
33.9

Billings in excess of costs and estimated earnings on uncompleted contracts(2)
(29.4
)
 
(53.3
)
Net billings in excess of costs and estimated earnings
$
(0.6
)
 
$
(19.4
)
___________________________________________________________________
(1) 
Reported as a component of “Accounts receivable, net.”
(2) 
Reported as a component of “Accrued expenses.”