Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

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, 2017	$	263.6		$	113.7		$	377.3
Translation adjustments	(0.4		)	(1.8		)	(2.2		)
Balance at December 31, 2018	263.2			111.9			375.1
Acquisitions	13.9			—			13.9
Translation adjustments	0.2			(0.4		)	(0.2		)
Balance at December 31, 2019	$	277.3		$	111.5		$	388.8

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:



	2019							2018
(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)	$	108.6	$	(20.5	)	$	88.1	$	90.9	$	(12.1	)	$	78.8
Other^(a)	4.2		(1.6		)	2.6		2.9		(1.3		)	1.6
Total definite-lived intangible assets	112.8		(22.1		)	90.7		93.8		(13.4		)	80.4
Indefinite-lived intangible assets:
Trade names	72.2		—			72.2		62.7		—			62.7
Total indefinite-lived intangible assets	72.2		—			72.2		62.7		—			62.7
Total intangible assets	$	185.0	$	(22.1	)	$	162.9	$	156.5	$	(13.4	)	$	143.1

(a)

Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and eight 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:



	2019							2018
(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)	$	108.6	$	(20.5	)	$	88.1	$	90.9	$	(12.1	)	$	78.8
Other^(a)	4.2		(1.6		)	2.6		2.9		(1.3		)	1.6
Total definite-lived intangible assets	112.8		(22.1		)	90.7		93.8		(13.4		)	80.4
Indefinite-lived intangible assets:
Trade names	72.2		—			72.2		62.7		—			62.7
Total indefinite-lived intangible assets	72.2		—			72.2		62.7		—			62.7
Total intangible assets	$	185.0	$	(22.1	)	$	162.9	$	156.5	$	(13.4	)	$	143.1

(a)