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Accounts Receivable, net
12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Accounts Receivable, net
7. Accounts Receivable, net

Accounts receivable, net consist of the following (in millions):
December 31,
 20192018
Contracts in progress$177.7 $134.4 
Trade receivables60.6 127.5 
Unbilled retentions53.9 65.6 
Other receivables21.1 4.1 
Allowance for doubtful accounts(1.5)(0.8)
Total accounts receivable, net$311.8 $330.8