Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

Net Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Net Revenues (Details) - USD ($) $ in Millions	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Net revenues	$ 1,172.6	$ 1,070.2	$ 3,357.7	$ 3,034.1
Allegion Americas \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	942.4	844.0	2,670.9	2,423.3
Allegion International \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	230.2	226.2	686.8	610.8
Products
Disaggregation of Revenue [Line Items]
Net revenues	1,098.8	1,009.8	3,141.0	2,851.3
Products \| Allegion Americas
Disaggregation of Revenue [Line Items]
Net revenues	896.2	806.2	2,526.4	2,305.3
Products \| Allegion International
Disaggregation of Revenue [Line Items]
Net revenues	202.6	203.6	614.6	546.0
Services and software
Disaggregation of Revenue [Line Items]
Net revenues	73.8	60.4	216.7	182.8
Services and software \| Allegion Americas
Disaggregation of Revenue [Line Items]
Net revenues	46.2	37.8	144.5	118.0
Services and software \| Allegion International
Disaggregation of Revenue [Line Items]
Net revenues	$ 27.6	$ 22.6	$ 72.2	$ 64.8