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Business Segment Information
 9 Months Ended
Sep. 30, 2026
Segment Reporting [Abstract]  
Business Segment Information BUSINESS SEGMENT INFORMATION
The Company classifies its business into the following two reportable segments based on industry and market focus: Allegion Americas and Allegion International. The Company largely evaluates performance based on Segment operating income and Segment operating margins. The Company’s chief operating decision maker (the “CODM”) is its chief executive officer, who uses segment operating income as the measure of profit or loss to evaluate the financial performance of the business and as the basis for resource allocation, performance reviews and compensation. For these reasons, the Company believes that Segment operating income represents the most relevant measure of segment profit or loss. The Company’s CODM may exclude certain charges or gains, such as corporate charges and other special charges, from Operating income to arrive at a Segment operating income that is a more meaningful measure of profit or loss upon which to base operating decisions.
A summary of operations by reportable segment for the three and nine months ended September 30 was as follows:
Three months endedNine months ended
In millions2026202520262025
Allegion Americas
Net revenues$942.4 $844.0 $2,670.9 $2,423.3 
Cost of goods sold494.0 456.0 1,440.7 1,309.2 
Selling and administrative expenses153.8 145.6 453.7 423.7 
Segment operating income$294.6 $242.4 $776.5 $690.4 
Depreciation and amortization
$20.8 $20.4 $61.6 $59.2 
Allegion International
Net revenues$230.2 $226.2 $686.8 $610.8 
Cost of goods sold130.4 124.4 396.8 346.1 
Selling and administrative expenses82.6 82.1 249.7 217.6 
Segment operating income$17.2 $19.7 $40.3 $47.1 
Depreciation and amortization$14.3 $15.0 $43.1 $36.2 
Reconciliation to earnings before income taxes
Segment operating income from reportable segments$311.8 $262.1 $816.8 $737.5 
Unallocated corporate expense27.2 28.3 82.2 87.6 
Interest expense24.2 26.6 73.2 75.9 
Other income, net(7.4)(1.7)(5.8)(10.5)
Total earnings before income taxes$267.8 $208.9 $667.2 $584.5