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.

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Net Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Net Revenues (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Net revenues	$ 1,022.0	$ 965.6	$ 1,963.9	$ 1,859.5
Allegion Americas \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	821.5	770.7	1,579.3	1,480.0
Allegion International \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	200.5	194.9	384.6	379.5
Products
Disaggregation of Revenue [Line Items]
Net revenues	958.9	904.7	1,838.4	1,737.1
Products \| Allegion Americas
Disaggregation of Revenue [Line Items]
Net revenues	783.3	733.0	1,498.0	1,399.8
Products \| Allegion International
Disaggregation of Revenue [Line Items]
Net revenues	175.6	171.7	340.4	337.3
Services and software
Disaggregation of Revenue [Line Items]
Net revenues	63.1	60.9	125.5	122.4
Services and software \| Allegion Americas
Disaggregation of Revenue [Line Items]
Net revenues	38.2	37.7	81.3	80.2
Services and software \| Allegion International
Disaggregation of Revenue [Line Items]
Net revenues	$ 24.9	$ 23.2	$ 44.2	$ 42.2