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Accounts Receivable, Net
12 Months Ended
Dec. 31, 2022
Receivables [Abstract]  
Accounts Receivable, Net
4. Accounts Receivable, Net

Accounts receivable, net as of the periods indicated consisted of the following (in millions):
December 31,
 20222021
Contracts in progress$244.8 $226.8 
Unbilled retentions0.2 0.4 
Trade receivables5.9 9.9 
Other receivables4.5 10.6 
Allowance for doubtful accounts(0.5)(0.6)
Total$254.9 $247.1