Goodwill (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill by Reporting Segment

The changes in the carrying amount of goodwill and accumulated impairment losses by reporting segment during the years ended December 31, 2021 and 2020 are as follows:

(in millions)	Infrastructure Solutions		Materials Solutions		Total
Balance, December 31, 2019:
Goodwill	$	32.7	$	32.8	$	65.5
Accumulated impairment losses	(20.2)		(12.2)		(32.4)
Net	$	12.5	$	20.6	$	33.1
2020 Activity:
Foreign currency translation	$	0.3	$	0.5	$	0.8
Acquisitions	6.4		—		6.4
Impairment	(1.6)		—		(1.6)
Total 2020 activity	$	5.1	$	0.5	$	5.6
Balance, December 31, 2020:
Goodwill	$	39.4	$	33.3	$	72.7
Accumulated impairment	(21.8)		(12.2)		(34.0)
Net	$	17.6	$	21.1	$	38.7
2021 Activity:
Foreign currency translation	$	0.1	$	(0.1)	$	—
Acquisitions	(0.1)		—		(0.1)
Total 2021 activity	$	—	$	(0.1)	$	(0.1)
Balance, December 31, 2021:
Goodwill	$	39.4	$	33.2	$	72.6
Accumulated impairment	(21.8)		(12.2)		(34.0)
Net	$	17.6	$	21.0	$	38.6