Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

The following table summarizes the carrying amount of goodwill and changes in the carrying amount of goodwill, by segment:


(in millions)	Environmental Solutions		Safety & Security Systems		Total
Balance at December 31, 2019	$	277.3	$	111.5	$	388.8
Acquisitions	2.5		—		2.5
Translation adjustments	0.1		2.8		2.9
Balance at December 31, 2020	279.9		114.3		394.2
Acquisitions	40.3		—		40.3
Translation adjustments	—		(2.3)		(2.3)
Balance at December 31, 2021	$	320.2	$	112.0	$	432.2

Schedule of Finite-Lived Intangible Assets

The following table summarizes the gross carrying amount and accumulated amortization of intangible assets for each major class of intangible assets:


	2021						2020
(in millions)	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Definite-lived intangible assets:
Customer relationships (a)	$	146.2	$	(39.8)	$	106.4	$	108.6	$	(29.6)	$	79.0
Other (a)	5.3		(2.9)		2.4		4.4		(2.3)		2.1
Total definite-lived intangible assets	151.5		(42.7)		108.8		113.0		(31.9)		81.1
Indefinite-lived intangible assets:
Trade names	96.9		—		96.9		72.4		—		72.4
Total indefinite-lived intangible assets	96.9		—		96.9		72.4		—		72.4
Total intangible assets	$	248.4	$	(42.7)	$	205.7	$	185.4	$	(31.9)	$	153.5

(a) Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and seven years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 12 years.

Schedule of Indefinite-Lived Intangible Assets

The following table summarizes the gross carrying amount and accumulated amortization of intangible assets for each major class of intangible assets:


	2021						2020
(in millions)	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Definite-lived intangible assets:
Customer relationships (a)	$	146.2	$	(39.8)	$	106.4	$	108.6	$	(29.6)	$	79.0
Other (a)	5.3		(2.9)		2.4		4.4		(2.3)		2.1
Total definite-lived intangible assets	151.5		(42.7)		108.8		113.0		(31.9)		81.1
Indefinite-lived intangible assets:
Trade names	96.9		—		96.9		72.4		—		72.4
Total indefinite-lived intangible assets	96.9		—		96.9		72.4		—		72.4
Total intangible assets	$	248.4	$	(42.7)	$	205.7	$	185.4	$	(31.9)	$	153.5