Strategic Transformation and Restructuring, Impairment and Other Asset Charges (Tables)

12 Months Ended

Dec. 31, 2021

Restructuring and Related Activities [Abstract]

Restructuring and Asset Impairment Charges

The restructuring, asset impairment charges and net gain on sale of property and equipment incurred in 2021, 2020 and 2019 are as follows:

	Years Ended December 31,
(in millions)	2021		2020		2019
Restructuring related charges:
Costs associated with closing Tacoma	$	1.6	$	0.9	$	—
Costs associated with closing Enid	0.7		2.5		—
Costs associated with closing Mequon	0.6		3.3		—
Costs associated with closing Albuquerque	—		1.3		—
Costs associated with closing AMM	—		0.3		1.3
Costs associated with exiting the wood pellet business	—		—		0.5
Workforce reductions at multiple sites	—		1.3		1.1
Other restructuring charges	—		0.3		—
Total restructuring related charges	2.9		9.9		2.9
Asset impairment charges:
Airplane impairment charges	—		2.3		0.3
Goodwill impairment charges	—		1.6		—
Other impairment charges	0.2		0.5		—
Total asset impairment charges	0.2		4.4		0.3
Gain on sale of property and equipment, net:
Gain on sale of property and equipment, net	(0.6)		(6.2)		—
Total gain on sale of property and equipment, net	(0.6)		(6.2)		—
Restructuring, impairment and other asset charges, net	$	2.5	$	8.1	$	3.2

Restructuring charges by segment are as follows:

	Years Ended December 31,
(in millions)	2021		2020		2019
Infrastructure Solutions	$	2.4	$	6.2	$	2.9
Materials Solutions	0.5		3.6		—
Corporate	—		0.1		—
Total restructuring related charges	$	2.9	$	9.9	$	2.9

Schedule of Asset Impairment Charges

Impairment charges by segment are as follows:

	Years Ended December 31,
(in millions)	2021		2020		2019
Infrastructure Solutions	$	—	$	1.9	$	—
Materials Solutions	0.2		(0.2)		0.3
Corporate	—		2.7		—
Total impairment charges	$	0.2	$	4.4	$	0.3

Schedule of Fixed Asset Sales

The net gain on sale of property and equipment by segment are as follows:

	Years Ended December 31,
(in millions)	2021		2020		2019
Infrastructure Solutions	$	(0.5)	$	(1.5)	$	—
Materials Solutions	(0.1)		(4.7)		—
Total gain on sale of property and equipment, net	$	(0.6)	$	(6.2)	$	—