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Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities (Tables)
 3 Months Ended
Mar. 31, 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):
 
March 31,
2020
 
December 31,
2019
Contract billings
$
806.0

 
$
860.4

Less allowance
(9.9
)
 
(10.1
)
Accounts receivable, net of allowance
$
796.1

 
$
850.3

 
 
 
 
Retainage
288.5

 
345.2

Unbilled receivables
709.4

 
679.4

Contract assets
$
997.9

 
$
1,024.6