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Accounts Receivable, net
3 Months Ended
Mar. 31, 2021
Receivables [Abstract]  
Accounts Receivable, net
6. Accounts Receivable, net

Accounts receivable, net consist of the following (in millions):
March 31,
2021
December 31,
2020
 
Contracts in progress$114.6 $118.6 
Unbilled retentions50.9 50.3 
Trade receivables7.2 7.5 
Other receivables14.3 8.9 
Allowance for doubtful accounts(0.6)(0.6)
Total$186.4 $184.7