| Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net revenues | - | - | - | - | - | 2,854 | 2,720 | 2,867 | 3,272 | 3,651 | 3,772 |
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| Cost of goods sold | 1,265 | 1,199 | 1,253 | 1,338 | 1,558 | 1,602 | 1,541 | 1,663 | 1,950 | 2,069 | 2,104 |
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| Selling and administrative expenses | 527 | 511 | 560 | 583 | 648 | 687 | 636 | 675 | 736 | 866 | 888 |
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| Impairment of intangible assets | - | - | - | - | - | - | 102 | - | - | 8 | - |
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| Operating income | 326 | 359 | 426 | 488 | 526 | 565 | 404 | 530 | 586 | 708 | 781 |
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| Interest expense | 54 | 53 | 64 | 106 | 54 | 56 | 51 | 50 | 76 | 93 | 102 |
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| Loss on divestitures | - | -103 | -84 | - | - | -30 | - | - | -8 | - | - |
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| Other income, net | -5 | 8 | 18 | 13 | 3 | -4 | 13 | 44 | 12 | 2 | 20 |
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| Earnings before income taxes | 268 | 209 | 295 | 396 | 475 | 475 | 365 | 524 | 515 | 617 | 699 |
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| Provision for income taxes | 84 | 55 | 64 | 119 | 40 | 73 | 51 | 41 | 56 | 77 | 101 |
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| Net earnings | 173 | 154 | 231 | 277 | 435 | 402 | 315 | 483 | 458 | 541 | 598 |
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| Net Income (Loss) Attributable to Noncontrolling Interest | -3 | 0 | 2 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | - |
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| Net earnings attributable to Allegion plc | 175 | 154 | 231 | 277 | 435 | 402 | 315 | 483 | 458 | 541 | 598 |
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| Currency translation | -66 | -60 | -41 | 98 | -57 | 13 | 57 | -63 | -76 | 34 | -74 |
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| Unrealized net gains arising during period | - | - | - | - | - | - | 4 | 3 | 6 | 0 | 3 |
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| Net gains reclassified into earnings | - | - | - | - | - | - | 6 | 0 | 0 | 1 | 1 |
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| Tax (expense) benefit | - | - | - | - | - | - | -0 | 1 | 0 | -0 | 1 |
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| Total cash flow hedges, net of tax | - | - | - | - | - | - | -1 | 2 | 5 | -0 | 1 |
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| Prior service costs and net actuarial losses, net | -10 | -38 | 3 | 26 | -17 | -8 | 5 | 26 | -39 | -9 | -4 |
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| Amortization reclassified into earnings | - | - | - | - | - | - | 5 | 5 | 1 | 4 | 5 |
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| Settlements/curtailments reclassified into earnings | - | - | - | - | - | - | 0 | 1 | - | 0 | 0 |
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| Currency translation and other | 5 | 5 | 14 | 1 | 5 | -3 | -2 | 1 | 8 | -5 | 3 |
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| Tax (expense) benefit | 16 | 3 | -5 | -12 | 2 | -0 | -2 | -8 | 9 | 2 | -0 |
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| Total defined benefit plan adjustments, net of tax | -15 | 23 | -19 | -19 | 5 | 3 | -6 | -24 | 21 | 9 | -3 |
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| Other comprehensive (loss) income, net of tax | -52 | -85 | -32 | 117 | -60 | 5 | 62 | -37 | -92 | 24 | -70 |
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| Total comprehensive income, net of tax | 120 | 69 | 199 | 394 | 375 | 407 | 376 | 446 | 366 | 565 | 527 |
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| Less: Total comprehensive income (loss) attributable to noncontrolling interests | -3 | -1 | 2 | 3 | 1 | 0 | 1 | 0 | -0 | 0 | - |
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| Total comprehensive income attributable to Allegion plc | 124 | 70 | 197 | 391 | 374 | 407 | 376 | 446 | 367 | 565 | 527 |
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| Earnings Per Share, Basic | 1.82 | 1.6 | 2.39 | 2.87 | 4.58 | 4.29 | 3.41 | 5.37 | 5.2 | 6.15 | 6.85 |
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| Earnings Per Share, Diluted | 1.8 | 1.59 | 2.36 | 2.85 | 4.54 | 4.26 | 3.39 | 5.34 | 5.19 | 6.12 | 6.82 |
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