v3.26.1
Goodwill (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2026
USD ($)
Goodwill [Roll Forward]  
Goodwill, net beginning balance $ 1,912.4
Goodwill, Acquired During Period 32.4
Currency translation (19.2)
Goodwill, net ending balance 1,925.6
Goodwill, Impaired, Accumulated Impairment Loss 573.6
Allegion Americas  
Goodwill [Roll Forward]  
Goodwill, net beginning balance 1,281.1
Goodwill, Acquired During Period 32.0
Currency translation (4.6)
Goodwill, net ending balance 1,308.5
Allegion International  
Goodwill [Roll Forward]  
Goodwill, net beginning balance 631.3
Goodwill, Acquired During Period 0.4
Currency translation (14.6)
Goodwill, net ending balance $ 617.1