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Accounts Receivable, net
6 Months Ended
Jun. 30, 2019
Receivables [Abstract]  
Accounts Receivable, net
7. Accounts Receivable, net

Accounts receivable, net consist of the following (in millions):
 
 
June 30, 2019
 
December 31, 2018
Contracts in progress
 
$
171.7

 
$
188.2

Trade receivables
 
99.9

 
127.5

Unbilled retentions
 
67.1

 
65.6

Other receivables
 
18.0

 
4.2

Allowance for doubtful accounts
 
(6.0
)
 
(6.3
)
Total accounts receivable, net
 
$
350.7

 
$
379.2