Net Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue
Net revenues	$ 3,650.8	$ 3,271.9	$ 2,867.4
Allegion Americas
Disaggregation of Revenue
Net revenues	2,913.6	2,530.7	2,050.0
Allegion International
Disaggregation of Revenue
Net revenues	737.2	741.2	817.4
Products
Disaggregation of Revenue
Net revenues	3,459.2	3,159.8	2,833.5
Products | Allegion Americas
Disaggregation of Revenue
Net revenues	2,756.7	2,455.8	2,048.2
Products | Allegion International
Disaggregation of Revenue
Net revenues	702.5	704.0	785.3
Service [Member]
Disaggregation of Revenue
Net revenues	191.6	112.1	33.9
Service [Member] | Allegion Americas
Disaggregation of Revenue
Net revenues	156.9	74.9	1.8
Service [Member] | Allegion International
Disaggregation of Revenue
Net revenues	$ 34.7	$ 37.2	$ 32.1