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Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities (Tables)
 6 Months Ended
Jun. 30, 2020
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):
 
June 30,
2020
 
December 31,
2019
Contract billings
$
949.9

 
$
860.4

Less allowance
(22.1
)
 
(10.1
)
Accounts receivable, net of allowance
$
927.8

 
$
850.3

 
 
 
 
Retainage
290.1

 
345.2

Unbilled receivables
675.8

 
679.4

Contract assets
$
965.9

 
$
1,024.6