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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 394.2	$ 388.8
Translation adjustments	(2.3)	2.9
Goodwill acquired	40.3	2.5
Goodwill, ending balance	432.2	394.2
Environmental Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	279.9	277.3
Translation adjustments	0.0	0.1
Goodwill acquired	40.3	2.5
Goodwill, ending balance	320.2	279.9
Safety And Security Systems
Goodwill [Roll Forward]
Goodwill, beginning balance	114.3	111.5
Translation adjustments	(2.3)	2.8
Goodwill acquired	0.0	0.0
Goodwill, ending balance	$ 112.0	$ 114.3

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
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-Section 55
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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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-Publisher FASB
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-SubTopic 20
-Section 50
-Paragraph 1
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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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