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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$204.7  $188.2  
Trade receivables60.6  127.5  
Unbilled retentions53.9  65.6  
Other receivables21.1  4.2  
Allowance for doubtful accounts(2.5) (6.3) 
Total accounts receivable, net$337.8  $379.2