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Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities (Tables)
 9 Months Ended
Sep. 30, 2018
Receivables [Abstract]  
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets
The following table provides details of accounts receivable, net of allowance and contract assets (together, “accounts receivable, net”) as of the dates indicated (in millions):
 
September 30,
2018
 
December 31,
2017
Contract billings
$
520.8

 
$
683.9

Less allowance for doubtful accounts
(11.6
)
 
(8.2
)
Accounts receivable, net of allowance
$
509.2

 
$
675.7

Retainage
320.8

 
323.1

Costs and earnings in excess of billings
1,538.6

 
599.2

Retainage and costs and earnings in excess of billings (together, “contract assets”)
$
1,859.4

 
$
922.3

Accounts receivable, net
$
2,368.6

 
$
1,598.0