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Accounts Receivable, net (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
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