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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Goodwill [Roll Forward]  
Goodwill, beginning balance $ 394.2
Goodwill acquired during the period 14.3
Translation adjustments (1.6)
Goodwill, ending balance 406.9
Environmental Solutions  
Goodwill [Roll Forward]  
Goodwill, beginning balance 279.9
Goodwill acquired during the period 14.3
Translation adjustments 0.1
Goodwill, ending balance 294.3
Safety and Security Systems  
Goodwill [Roll Forward]  
Goodwill, beginning balance 114.3
Goodwill acquired during the period 0.0
Translation adjustments (1.7)
Goodwill, ending balance $ 112.6