Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Unsatisfied Performance Obligations

Unsatisfied Performance Obligations

The following table includes estimated revenue expected to be recognized in future periods related to performance obligations that are unsatisfied or partially satisfied as of December 31, 2019 and the percentage of the outstanding performance obligations as of December 31, 2019 expected to be delivered during 2020:

	Unsatisfied performance obligations at
	December 31, 2019
	Total Amount		Percent expected to be delivered in 2020
	(in millions)
Energy Equipment Group:
Wind towers and utility structures	$	596.8	86.0	%
Other	$	36.2	100.0	%
Transportation Products Group:
Inland barges	$	346.9	100.0	%