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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

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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