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Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2019
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):
 
December 31,
 
2019
 
2018
Contract billings
$
860.4

 
$
687.6

Less allowance for doubtful accounts
(10.1
)
 
(16.3
)
Accounts receivable, net of allowance
$
850.3

 
$
671.3

 
 
 
 
Retainage
$
345.2

 
$
230.2

Unbilled receivables
679.4

 
1,022.4

Contract assets
$
1,024.6

 
$
1,252.6