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Basis of Presentation and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Revenue under percentage of completion	$ 255.5	$ 336.1
Costs incurred on uncompleted contracts	1,261.3
Estimated earnings to date	(59.9)
Aggregate costs incurred on uncompleted contracts and estimated earnings to date	1,201.4
Billings to date	(1,202.0)
Net billings in excess of billings after acquisition	(0.6)
Costs in excess of billings	28.8
Billings in excess of cost	(29.4)
Net billings in excess of costs and estimated earnings	$ (0.6)

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Represents the aggregate of costs incurred and estimated earnings to date on uncompleted contracts accounted for under the percentage-of-completion method.

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Represents the net costs and estimated earnings on contracts in excess of billings on uncompleted contracts accounted for under the percent definition of completion method, after considering the contracts assumed in the Clyde Union acquisition.

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Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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