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Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2021
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,
20212020
Contract billings
$1,027.1 $805.0 
Less allowance(7.8)(20.5)
Accounts receivable, net of allowance
$1,019.3 $784.5 
Retainage
$296.8 $287.7 
Unbilled receivables
931.1 682.0 
Contract assets$1,227.9 $969.7