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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill
The following table summarizes the carrying amount of goodwill and changes in the carrying amount of goodwill, by segment:
(in millions of dollars)Environmental
Solutions		Safety & Security
Systems		Total
Balance at December 31, 2021$320.2 $112.0 $432.2 
Acquisitions, including measurement period adjustments24.0 — 24.0 
Translation adjustments(0.4)(2.4)(2.8)
Balance at December 31, 2022343.8 109.6 453.4 
Acquisitions, including measurement period adjustments17.8 — 17.8 
Translation adjustments0.3 1.2 1.5 
Balance at December 31, 2023$361.9 $110.8 $472.7 
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:
 20232022
(in millions of dollars)Gross Carrying ValueAccumulated AmortizationNet Carrying ValueGross Carrying ValueAccumulated AmortizationNet Carrying Value
Definite-lived intangible assets:
Customer relationships (a)
$161.6 $(66.3)$95.3 $153.7 $(52.0)$101.7 
Other (a)
8.1 (4.4)3.7 5.7 (3.4)2.3 
Total definite-lived intangible assets169.7 (70.7)99.0 159.4 (55.4)104.0 
Indefinite-lived intangible assets:
Trade names104.2 — 104.2 99.9 — 99.9 
Other4.3 — 4.3 4.3 — 4.3 
Total indefinite-lived intangible assets108.5 — 108.5 104.2 — 104.2 
Total intangible assets$278.2 $(70.7)$207.5 $263.6 $(55.4)$208.2 
(a)    Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 11 years and 6 years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 11 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:
 20232022
(in millions of dollars)Gross Carrying ValueAccumulated AmortizationNet Carrying ValueGross Carrying ValueAccumulated AmortizationNet Carrying Value
Definite-lived intangible assets:
Customer relationships (a)
$161.6 $(66.3)$95.3 $153.7 $(52.0)$101.7 
Other (a)
8.1 (4.4)3.7 5.7 (3.4)2.3 
Total definite-lived intangible assets169.7 (70.7)99.0 159.4 (55.4)104.0 
Indefinite-lived intangible assets:
Trade names104.2 — 104.2 99.9 — 99.9 
Other4.3 — 4.3 4.3 — 4.3 
Total indefinite-lived intangible assets108.5 — 108.5 104.2 — 104.2 
Total intangible assets$278.2 $(70.7)$207.5 $263.6 $(55.4)$208.2 
(a)    Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 11 years and 6 years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 11 years.