Revisions in Estimates - Schedule of Projects Summarized (Details) - Downward Estimate Change [Member] $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) project	Dec. 31, 2017 USD ($) project	Dec. 31, 2016 USD ($) project
Change In Accounting Estimate [Line Items]
Number of projects with downward estimate changes | project	5	6	4
Increase (decrease) on project profitability	$ 86.5	$ 67.2	$ 39.4
Minimum [Member]
Change In Accounting Estimate [Line Items]
Range of reduction in gross profit from each project, net	(5.3)	(6.1)	(6.0)
Maximum [Member]
Change In Accounting Estimate [Line Items]
Range of reduction in gross profit from each project, net	$ (32.0)	$ (17.2)	$ (13.6)