Allegion (ALLE) 10-Q 30 Apr 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	3 Months Ended
	Mar. 31, 2015	Apr. 27, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	Allegion plc
Entity Central Index Key	1579241
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		95,676,557

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net revenues	$458.70	$466.60
Cost of goods sold	-271.6	-274.4
Selling and administrative expenses	-116.1	-124.4
Operating income	71	67.8
Interest expense	-11.6	-13.1
Other (gain) loss, net	3.1	-0.1
Earnings before income taxes	56.3	54.8
Provision for income taxes	-12.4	-16.4
Earnings from continuing operations	43.9	38.4
Discontinued operations, net of tax	-0.2	-0.8
Net earnings	43.7	37.6
Less: Net (earnings) loss attributable to noncontrolling interests	1.7	-1.8
Net earnings attributable to Allegion plc	45.4	35.8
Amounts attributable to Allegion plc ordinary shareholders:
Continuing operations	45.6	36.6
Discontinued operations	-0.2	-0.8
Net earnings attributable to Allegion plc	45.4	35.8
Basic:
Continuing operations (in dollars per share)	$0.48	$0.38
Discontinued operations (in dollars per share)	($0.01)	($0.01)
Net earnings (loss) (in dollars per share)	$0.47	$0.37
Diluted:
Continuing operations (in dollars per share)	$0.47	$0.38
Discontinued operations (in dollars per share)	$0	($0.01)
Net earnings (loss) (in dollars per share)	$0.47	$0.37
Weighted-average shares outstanding
Basic (in shares)	95.9	96.3
Diluted (in shares)	96.9	97.4
Dividends declared per ordinary share (in dollars per share)	$0.10	$0.08
Total comprehensive income	13.3	23.6
Less: Total comprehensive income (loss) attributable to noncontrolling interests	-1.7	1
Total comprehensive income attributable to Allegion plc	$15	$22.60

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
ASSETS
Cash and cash equivalents	$229.60	$290.50
Accounts and notes receivable, net	255.8	259.9
Costs in excess of billings on uncompleted contracts	177.1	181.1
Inventories	184.9	179.5
Other current assets	56.3	62.8
Total current assets	903.7	973.8
Property, plant and equipment, net	206.3	211.2
Goodwill	498.6	506
Intangible assets, net	111.7	125.7
Other noncurrent assets	207.1	199.2
Total assets	1,927.40	2,015.90
LIABILITIES AND EQUITY
Accounts payable	231.5	249.5
Accrued expenses and other current liabilities	201.2	232.2
Short-term borrowings and current maturities of long-term debt	49.4	49.6
Total current liabilities	482.1	531.3
Long-term debt	1,202.70	1,215
Other noncurrent liabilities	241.1	251.1
Total liabilities	1,925.90	1,997.40
Equity:
Ordinary shares	1	1
Capital in excess of par value	5.1	0
Retained earnings	152.8	142.4
Accumulated other comprehensive loss	-178.7	-148.2
Total Allegion plc shareholders’ deficit	-19.8	-4.8
Noncontrolling interests	21.3	23.3
Total equity	1.5	18.5
Total liabilities and equity	$1,927.40	$2,015.90

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Cash Flows [Abstract]
Net earnings (loss)	$43.70	$37.60
Cash flows from operating activities:
Discontinued operations, net of tax	0.2	0.8
Adjustments to arrive at net cash provided by (used in) operating activities:
Depreciation and amortization	12.1	12.2
Changes in assets and liabilities and other non-cash items	-51.4	-50.6
Net cash provided by continuing operating activities	4.6	0
Net cash provided by (used in) discontinued operating activities	-0.2	-0.9
Net cash provided by (used in) operating activities	4.4	-0.9
Cash flows from financing activities:
Debt repayments	-12.4	-8
Dividends paid to ordinary shareholders	9.5	7.2
Repurchase of ordinary shares	-30	0
Other financing activities, net	5.2	11.8
Net cash used in continuing financing activities	-46.7	-3.4
Capital expenditures	-9.4	-9.2
Acquisition of and equity investments in businesses, net of cash acquired	-9	-5.3
Other investing activities, net	4	0.2
Net cash used in investing activities	-14.4	-14.3
Effect of exchange rate changes on cash and cash equivalents	-4.2	-3.4
Net decrease in cash and cash equivalents	-60.9	-22
Cash and cash equivalents - beginning of period	290.5
Cash and cash equivalents - end of period	$229.60

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation
	The accompanying condensed and consolidated financial statements of Allegion plc, an Irish public limited company, and its consolidated subsidiaries ("Allegion" or "the Company"), reflect the consolidated operations of the Company and have been prepared in accordance with United States Securities and Exchange Commission ("SEC") interim reporting requirements. Accordingly, the accompanying condensed and consolidated financial statements do not include all disclosures required by accounting principles generally accepted in the United States of America ("GAAP") for full financial statements and should be read in conjunction with the consolidated financial statements included in the Allegion Annual Report on Form 10-K for the year ended December 31, 2014. In the opinion of management, the accompanying condensed and consolidated financial statements contain all adjustments, which include normal recurring adjustments, necessary to present fairly the consolidated unaudited results for the interim periods presented.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements
	Recently Adopted Accounting Pronouncements:
	In April 2014, the FASB issued ASU 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity," which amends the definition of a discontinued operation in Accounting Standards Codification Topic 205-20 (Presentation of Financial Statements — Discontinued Operations) and requires entities to disclose additional information about disposal transactions that do not meet the discontinued operations criteria. ASU 2014-08 redefines a discontinued operation as a component or group of components of an entity that (1) has been disposed of by sale or other than by sale or is classified as held for sale and (2) represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results. According to the ASU, a strategic shift that has (or will have) a major effect on an entity’s operations and results includes the disposal of a major geographical area, a major line of business, a major equity investment, or other major parts of an entity. The ASU is effective prospectively for disposals or components classified as held for sale in periods on or after December 15, 2014. The adoption of ASU 2014-08 did not have a significant impact on the Condensed and Consolidated Financial Statements.
	Recently Issued Accounting Pronouncements
	In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers." ASU 2014-09 is the result of a joint project between the FASB and International Accounting Standards Board ("IASB") to clarify the principles for recognizing revenue and to develop a common revenue standard for GAAP and International Financial Reporting Standards ("IFRS") that would remove inconsistencies and weaknesses in revenue requirements, provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices across entities, industries, jurisdictions, and capital markets, provide more useful information to users of financial statements through improved disclosure requirements and simplify the preparation of financial statements by reducing the number of requirements to which an entity must refer. The ASU is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early application is not permitted. On April 1, 2015, the FASB proposed deferring the effective date by one year to December 15, 2017 for annual reporting periods beginning after that date. The FASB also proposed permitting early adoption of the standard, but not before the original effective date of December 15, 2016. The Company is assessing what impact ASU 2014-09 will have on the Condensed and Consolidated Financial Statements.
	In June 2014, the FASB issued ASU 2014-12, "Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period." ASU 2014-12 requires that a performance target that affects vesting, and that could be achieved after the requisite service period, be treated as a performance condition. As such, the performance target should not be reflected in estimating the grant date fair value of the award. This update further clarifies that compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. The ASU is effective for annual and interim reporting periods beginning after December 15, 2015, including interim periods within that reporting period. Early application is permitted. The requirements of ASU 2014-12 are not expected to have a significant impact on the Condensed and Consolidated Financial Statements.
	In August 2014, the FASB issued ASU 2014-15, "Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern." ASU 2014-15 guidance on management’s responsibility in evaluating whether there is substantial doubt about a company’s ability to continue as a going concern and to provide related footnote disclosures. ASU 2014-15 will be effective in the fourth quarter of 2016, with early adoption permitted. The requirements of ASU 2014-15 are not expected to have a significant impact on the Condensed and Consolidated Financial Statements.
	In April 2015, the FASB issued ASU 2015-03, "Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs." This standard amends existing guidance to require the presentation of debt issuance costs in the balance sheet as a deduction from the carrying amount of the related debt liability instead of as an asset. It is effective for annual reporting periods beginning after December 15, 2015, but early adoption is permitted. The requirements of ASU 2015-03 are not expected to have a significant impact on the Condensed and Consolidated Financial Statements. As of March 31, 2015 the Company had $17.6 million in unamortized debt issuance costs.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2015
Inventory, Net [Abstract]
Inventories	Inventories
	Inventories are stated at the lower of cost or net realizable value. In the fourth quarter of 2014, the Company changed its method of inventory costing for certain inventory in its Americas operating segment to the first-in first-out (FIFO) method from the last-in first-out (LIFO) method. The Company's other operating segments also determine inventory cost using the FIFO method.
	The major classes of inventory were as follows:
	In millions	March 31,		December 31,
		2015		2014
	Raw materials	$	59.7	$	54.8
	Work-in-process	34.7		32.1
	Finished goods	90.5		92.6
	Total	$	184.9	$	179.5

Goodwill

Goodwill	3 Months Ended
	Mar. 31, 2015
Goodwill Disclosure [Abstract]
Goodwill	Goodwill
	The changes in the carrying amount of goodwill for the three months ended March 31, 2015 were as follows:
	In millions	Americas			EMEIA			Asia Pacific			Total
	December 31, 2014 (gross)	$	364.8		$	533.1		$	93.6		$	991.5
	Accumulated impairment	—			(478.6		)	(6.9		)	(485.5		)
	December 31, 2014 (net)	364.8			54.5			86.7			506
	Currency translation	(0.1		)	(5.6		)	(1.7		)	(7.4		)
	March 31, 2015 Goodwill (net)	$	364.7		$	48.9		$	85		$	498.6

Intangible_Assets

Intangible Assets	3 Months Ended
	Mar. 31, 2015
Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Assets
	The gross amount of the Company’s intangible assets and related accumulated amortization were as follows:
		March 31, 2015							December 31, 2014
	In millions	Gross carrying amount		Accumulated amortization			Net carrying amount		Gross carrying amount		Accumulated amortization			Net carrying amount
	Completed technologies/patents	$	26.3	$	(22.1	)	$	4.2	$	27.8	$	(23.2	)	$	4.6
	Customer relationships	84.4		(33.8		)	50.6		94.7		(37.0		)	57.7
	Trademarks (finite-lived)	79.7		(32.9		)	46.8		89.3		(36.0		)	53.3
	Other	10		(10.0		)	—		10.8		(10.8		)	—
	Total finite-lived intangible assets	200.4		$	(98.8	)	101.6		222.6		$	(107.0	)	115.6
	Trademarks (indefinite-lived)	10.1					10.1		10.1					10.1
	Total	$	210.5				$	111.7	$	232.7				$	125.7
	Intangible asset amortization expense was $1.8 million and $2.5 million for the three months ended March 31, 2015 and 2014, respectively. Future estimated amortization expense on existing intangible assets in each of the next five years amounts to approximately $6.9 million for full year 2015, $6.9 million for 2016, $6.9 million for 2017, $6.8 million for 2018, and $6.8 million for 2019.

Acquisition

Acquisition	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Acquisitions	Acquisitions
	In February 2015 the Company made an investment in iDevices, a brand and development partner in the Internet of Things industry. The investment is accounted for using the equity method.

Debt_and_Credit_Facilities

Debt and Credit Facilities	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt and Credit Facilities	Debt and Credit Facilities
	Long-term debt and other borrowings consisted of the following:
	In millions	March 31,		December 31,
		2015		2014
	Term Loan Facility due 2019	$	950.6	$	962.8
	5.75% Senior notes due 2021	300		300
	Other debt, including capital leases, maturing in various amounts through 2016	1.5		1.8
	Total debt	1,252.10		1,264.60
	Less: current portion of long term debt	49.4		49.6
		$	1,202.70	$	1,215.00
	Senior Secured Credit Facilities
	The Company has a credit agreement providing for (i) a $975.0 million Senior Secured Term Loan Facility maturing on October 15, 2019 (the "Term Loan Facility") and (ii) a $500.0 million Senior Secured Revolving Credit Facility (the "Revolver") maturing in 2018. The Company refers to these credit facilities as its "Senior Secured Credit Facilities." Allegion plc is the primary borrower for the Senior Secured Credit Facilities.
	Outstanding borrowings under the Senior Secured Credit Facilities currently accrue interest at LIBOR plus an applicable margin. The applicable margin for borrowings under the Revolver and the Term Loan Facility is subject to a credit facility rating-based pricing grid with the LIBOR ranging from 1.50% to 2.00%. The margin for the Term Loan Facility borrowings was 1.75% as of March 31, 2015.
	To manage the Company's exposure to fluctuations in LIBOR rates, the Company has interest rate swaps for $300.0 million of the Company's variable rate $975.0 million Term Loan Facility. Swaps with notional amounts totaling $275.0 million were effective in January 2015 and expire in September 2017 and swaps with notional amounts totaling $25.0 million were effective in January 2015 and expire in December 2016. The swaps exchange 90-day LIBOR for a fixed interest rate.
	The Company repaid $12.2 million of principal on its Term Loan Facility during the three months ended March 31, 2015 in accordance with the terms of its senior secured credit facility. At March 31, 2015, the Company did not have any borrowings outstanding under the Revolver and had $28.6 million of letters of credit outstanding.
	Senior Notes
	A wholly-owned subsidiary of the Company has issued $300.0 million of 5.75% senior notes due 2021 (the "Senior Notes"). The Senior Notes accrue interest at the rate of 5.75% per annum, payable semi-annually on April 1 and October 1 of each year. The Senior Notes mature on October 1, 2021.
	At March 31, 2015, the weighted-average interest rate for borrowings was 2.3% under the Term Loan Facility (including the effect of interest rate swaps) and 5.75% under the Senior Notes.

Financial_Instruments

Financial Instruments	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments	Financial Instruments
	In the normal course of business, the Company uses various financial instruments, including derivative instruments, to manage the risks associated with interest and currency rate exposures. These financial instruments are not used for trading or speculative purposes.
	On the date a derivative contract is entered into, the Company designates the derivative instrument as a cash flow hedge of a forecasted transaction, a cash flow hedge of a recognized asset or liability, or as an undesignated derivative. The Company formally documents its hedge relationships, including identification of the derivative instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction. This process includes linking derivative instruments that are designated as hedges to specific assets, liabilities or forecasted transactions.
	The fair market value of derivative instruments is determined through market-based valuations and may not be representative of the actual gains or losses that will be recorded when these instruments mature due to future fluctuations in the markets in which they are traded.
	The Company assesses at inception and at least quarterly thereafter, whether the derivatives used in cash flow hedging transactions are highly effective in offsetting the changes in the cash flows of the hedged item. To the extent the derivative is deemed to be a highly effective hedge, the fair market value changes of the instrument are recorded to accumulated other comprehensive loss.
	Any ineffective portion of a derivative instrument’s change in fair value is recorded in Net earnings in the period of change. If the hedging relationship ceases to be highly effective, or it becomes probable that a forecasted transaction is no longer expected to occur, the hedging relationship will be undesignated and any future gains and losses on the derivative instrument will be recorded in Net earnings.
	Currency Hedging Instruments
	The gross notional amount of the Company’s currency derivatives was $523.1 million and $494.5 million at March 31, 2015 and December 31, 2014, respectively. At March 31, 2015 and December 31, 2014, gains of $2.8 million and $1.6 million, net of tax, respectively, were included in Accumulated other comprehensive loss related to the fair value of the Company’s currency derivatives designated as accounting hedges. The amount expected to be reclassified into Net earnings over the next twelve months is a gain of $2.8 million. The actual amounts that will be reclassified to Net earnings may vary from this amount as a result of changes in market conditions. Gains and losses associated with the Company’s currency derivatives not designated as hedges are recorded in Net earnings as changes in fair value occur. At March 31, 2015, the maximum term of the Company’s currency derivatives was less than one year.
	Interest Rate Swaps
	In June 2014, the Company entered into forward starting interest rate swaps to fix the interest rate paid during the contract period for $300.0 million of the Company's variable rate $975.0 million Term Loan Facility. Swaps with notional amounts totaling $275.0 million effective January 2015 expire in September 2017 and swaps with notional amounts totaling $25.0 million effective January 2015 expire in December 2016. These interest rate swaps met the criteria to be accounted for as cash flow hedges of variable rate interest payments. Consequently, the changes in fair value of the interest rate swaps were recognized in Accumulated other comprehensive loss. At March 31, 2015, $2.3 million of losses were recorded in accumulated other comprehensive loss related to these interest rate swaps and none are expected to be reclassified into Interest expense over the next twelve months.
	The fair values of derivative instruments included within the Condensed and Consolidated Balance Sheets were as follows:
		Asset derivatives					Liability derivatives
	In millions	March 31,			December 31,		March 31,				December 31,
		2015			2014		2015				2014
	Derivatives designated as hedges:
	Currency derivatives	$	3.4		$	2.1	$	—			$	—
	Interest rate swaps	—			—		2.3				0.9
	Derivatives not designated as hedges:
	Currency derivatives	9.4			2.2		32.4				13.9
	Total derivatives	$	12.8		$	4.3	$	34.7			$	14.8
	Asset and liability derivatives included in the table above are recorded within Other current assets and Accrued expenses and other current liabilities, respectively.
	The amounts associated with derivatives designated as hedges affecting Net earnings and Accumulated other comprehensive loss for the three months ended March 31 were as follows:
		Amount of gain (loss)					Location of gain		Amount of gain (loss) reclassified from Accumulated other comprehensive loss and
		recognized in Accumulated other comprehensive loss					(loss) recognized		recognized into Net earnings
	In millions	2015			2014		in Net earnings		2015				2014
	Currency derivatives	$	3.3		$	0.7	Cost of goods sold		$	1.7			$	(0.4	)
	Interest rate swaps	(1.4		)	—		Interest expense		—				—
	Total	$	1.9		$	0.7			$	1.7			$	(0.4	)
	Concentration of Credit Risk
	The counterparties to the Company’s forward contracts and swaps consist of a number of investment grade major international financial institutions. The Company could be exposed to losses in the event of nonperformance by the counterparties. However, the credit ratings and the concentration of risk in these financial institutions are monitored on a continuous basis and present no significant credit risk to the Company.

Pensions_and_Postretirement_Be

Pensions and Postretirement Benefits Other than Pensions	3 Months Ended
	Mar. 31, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Pensions and Postretirement Benefits Other than Pensions	Pensions and Postretirement Benefits Other than Pensions
	The Company sponsors several U.S. defined benefit and defined contribution plans covering substantially all of its U.S. employees. Additionally, the Company has non-U.S. defined benefit and defined contribution plans covering eligible non-U.S. employees. Postretirement benefits, other than pensions, provide healthcare benefits, and in some instances, life insurance benefits for certain eligible employees.
	Pension Plans
	The noncontributory defined benefit pension plans covering non-collectively bargained U.S. employees provide benefits on an average pay formula while most plans for collectively bargained U.S. employees provide benefits on a flat dollar benefit formula. The non-U.S. pension plans generally provide benefits based on earnings and years of service. The Company also maintains additional other supplemental plans for officers and other key employees.
	The components of the Company’s net periodic pension benefit costs for the three months ended March 31 were as follows:
		U.S.
	In millions	2015			2014
	Service cost	$	2.4		$	1.8
	Interest cost	2.7			2.8
	Expected return on plan assets	(2.8		)	(2.8		)
	Net amortization of:
	Prior service costs	0.2			0.2
	Plan net actuarial losses	1.1			0.5
	Net periodic pension benefit cost	3.6			2.5
	Net settlement losses	0.6			—
	Net periodic pension benefit cost after settlement losses	$	4.2		$	2.5
		Non-U.S.
	In millions	2015			2014
	Service cost	$	0.8		$	1.2
	Interest cost	3.4			4.3
	Expected return on plan assets	(4.4		)	(4.3		)
	Amortization of plan net actuarial losses	0.4			0.7
	Net periodic pension benefit cost	$	0.2		$	1.9
	The Company made employer contributions of $0.1 million and $0.5 million during the three months ended March 31, 2015 and 2014 to its defined benefit pension plans. Additional contributions of approximately $5.0 million are expected during the remainder of 2015.
	Postretirement Benefits Other Than Pensions
	The Company sponsors several postretirement plans that provide for healthcare benefits, and in some instances, life insurance benefits that cover certain eligible retired employees. The Company funds postretirement benefit obligations principally on a pay as you go basis. Generally, postretirement health benefits are contributory with contributions adjusted annually. Life insurance plans for retirees are primarily noncontributory.
	The components of net periodic postretirement benefit income for the three months ended March 31 were as follows:
	In millions	2015			2014
	Service cost	$	—		$	0.1
	Interest cost	0.1			0.1
	Amortization of prior service gains	(0.4		)	(0.4		)
	Net periodic postretirement benefit income	$	(0.3	)	$	(0.2	)

Fair_Value_Measurement

Fair Value Measurement	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurement	Fair Value Measurement
	Fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Fair value measurements are based on a framework that utilizes the inputs market participants use to determine the fair value of an asset or liability and establishes a fair value hierarchy to prioritize those inputs. The fair value hierarchy is comprised of three levels that are described below:
	•	Level 1 – Inputs based on quoted prices in active markets for identical assets or liabilities.
	•	Level 2 – Inputs other than Level 1 quoted prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability.
	•	Level 3 – Unobservable inputs based on little or no market activity and that are significant to the fair value of the assets and liabilities.
	The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Observable inputs are obtained from independent sources and can be validated by a third party, whereas unobservable inputs reflect assumptions regarding what a third party would use in pricing an asset or liability based on the best information available under the circumstances. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement.
	Assets and liabilities measured at fair value at March 31, 2015 were as follows:
		Fair value measurements						Total
	In millions	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		fair value
	Recurring fair value measurements
	Assets:
	Marketable securities	$	23	$	—	$	—	$	23
	Foreign currency contracts	—		12.8		—		12.8
	Total asset recurring fair value measurements	23		$	12.8	$	—	$	35.8
	Liabilities:
	Foreign currency contracts	$	—	$	32.4	$	—	$	32.4
	Interest rate swap	—		2.3		—		2.3
	Total liability recurring fair value measurements	$	—	$	34.7	$	—	$	34.7
	Financial instruments not carried at fair value
	Total debt	—		1,265.40		—		1,265.40
	Total financial instruments not carried at fair value	$	—	$	1,265.40	$	—	$	1,265.40
	Assets and liabilities measured at fair value at December 31, 2014 were as follows:
		Fair value measurements						Total
	In millions	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		fair value
	Recurring fair value measurements
	Assets:
	Marketable securities	$	17.9	$	—	$	—	$	17.9
	Foreign currency contracts	—		4.3		—		4.3
	Total asset recurring fair value measurements	$	17.9	$	4.3	$	—	$	22.2
	Liabilities:
	Foreign currency contracts	$	—	$	13.9	$	—	$	13.9
	Interest rate swap	—		0.9		—		0.9
	Total liability recurring fair value measurements	$	—	$	14.8	$	—	$	14.8
	Financial instruments not carried at fair value
	Total debt	—		1,279.40		—		1,279.40
	Total financial instruments not carried at fair value	$	—	$	1,279.40	$	—	$	1,279.40
	The Company determines the fair value of its financial assets and liabilities using the following methodologies:
	•	Marketable securities – These securities include investments in publicly traded stock of non-U.S. companies held by non-U.S. subsidiaries of the Company. The fair value is obtained for the securities based on observable market prices quoted on public stock exchanges.
	•	Foreign currency contracts – These instruments include foreign currency contracts for non-functional currency balance sheet exposures. The fair value of the foreign currency contracts are determined based on a pricing model that uses spot rates and forward prices from actively quoted currency markets that are readily accessible and observable.
	•	Interest rate swaps – These instruments include forward-starting interest rate swap contracts for $300.0 million of the Company's variable rate debt. The fair value of the derivative instruments are determined based on quoted prices for the Company's swaps, which are not considered an active market.
	•	Debt – These securities are recorded at cost and include senior notes maturing through 2021. The fair value of the long-term debt instruments is obtained based on observable market prices quoted on public exchanges for similar instruments.
	The carrying values of cash and cash equivalents, accounts receivable, accounts payable and short-term borrowings are a reasonable estimate of their fair value due to the short-term nature of these instruments.
	These methodologies used by the Company to determine the fair value of its financial assets and liabilities at March 31, 2015 are the same as those used at December 31, 2014. There have been no significant transfers between Level 1 and Level 2 categories.

Equity

Equity	3 Months Ended
	Mar. 31, 2015
Stockholders' Equity Note [Abstract]
Equity	Equity
	The reconciliation of Ordinary shares is as follows:
	In millions	Total
	December 31, 2014	95.8
	Shares issued under incentive plans, net	0.3
	Repurchase of ordinary shares	(0.5	)
	March 31, 2015	95.6
	During the three months ended March 31, 2015, the Company paid $30.0 million to repurchase 0.5 million ordinary shares on the open market under a share repurchase program previously approved by its Board of Directors.
	The components of Equity for the three months ended March 31, 2015 were as follows:
	In millions	Allegion plc				Noncontrolling				Total
		shareholders’				interests				equity
		equity
	Balance at December 31, 2014	$	(4.8	)		$	23.3			$	18.5
	Net earnings	45.4				(1.7		)		43.7
	Currency translation	(38.9		)		0				(38.9		)
	Change in value of marketable securities and derivatives qualifying as cash flow hedges, net of tax	4.6				—				4.6
	Pension and OPEB adjustments, net of tax	3.9				—				3.9
	Total comprehensive income	15				(1.7		)		13.3
	Share-based compensation	3.6				—				3.6
	Dividends to noncontrolling interests	—				(0.3		)		(0.3		)
	Dividends to ordinary shareholders	(9.6		)		—				(9.6		)
	Repurchase of ordinary shares	(30.0		)		—				(30.0		)
	Shares issued under incentive plans, net	6				—				6
	Balance at March 31, 2015	$	(19.8	)		$	21.3			$	1.5
	The components of Equity for the three months ended March 31, 2014 were as follows:
	In millions	Allegion plc				Noncontrolling				Total
		shareholders’				interests				equity
		equity
	Balance at December 31, 2013	$	(66.1	)		$	31.1			$	(35.0	)
	Net earnings	35.8				1.8				37.6
	Currency translation	(12.1		)		(0.8		)		(12.9		)
	Change in value of marketable securities and derivatives qualifying as cash flow hedges, net of tax	(0.4		)		—				(0.4		)
	Pension and OPEB adjustments, net of tax	(0.7		)		—				(0.7		)
	Total comprehensive income	22.6				1				23.6
	Share-based compensation	3.4				—				3.4
	Dividends to ordinary shareholders	(7.7		)		—				(7.7		)
	Shares issued under incentive plans, net	11.8				—				11.8
	Other	(3.5		)		—				(3.5		)
	Balance at March 31, 2014	$	(39.5	)		$	32.1			$	(7.4	)
	Other Comprehensive Income (Loss)
	The changes in Accumulated other comprehensive income (loss) for the three months ended March 31, 2015 are as follows:
	In millions		Cash flow hedges and marketable securities				Pension and OPEB Items				Foreign Currency Items			Total
	December 31, 2014		$	15.7			$	(116.1	)		$	(47.8	)	$	(148.2	)
	Other comprehensive income before reclassifications		6.6				2.7				(38.9		)	(29.6		)
	Amounts reclassified from accumulated other comprehensive income		(1.7		)		1.3				—			(0.4		)
	Tax (expense) benefit		(0.4		)		(0.1		)		—			(0.5		)
	March 31, 2015		$	20.2			$	(112.2	)		$	(86.7	)	$	(178.7	)
	The changes in Accumulated other comprehensive income (loss) for the three months ended March 31, 2014 are as follows:
	In millions		Cash flow hedges and marketable securities				Pension and OPEB Items				Foreign Currency Items			Total
	December 31, 2013		$	16.7			$	(131.3	)		$	17.9		$	(96.7	)
	Other comprehensive income before reclassifications		0.1				—				(12.1		)	(12.0		)
	Amounts reclassified from accumulated other comprehensive income		(0.4		)		(0.7		)		—			(1.1		)
	Tax (expense) benefit		(0.1		)		—				—			(0.1		)
	March 31, 2014		$	16.3			$	(132.0	)		$	5.8		$	(109.9	)
	The reclassifications out of Accumulated other comprehensive income (loss) for the three months ended March 31, 2015 were as follows:
			Amount Reclassified from Accumulated Other Comprehensive Income
	In millions		Three months ended				Statement of Comprehensive Income Line Item
	Reclasses below represent (Income) loss to the Statement of Comprehensive Income
	Gains losses on cash flow hedges:
	Foreign exchange contracts		$	(1.7	)		Cost of goods sold
			(1.7		)		Earnings before income taxes
			—				Provision for income taxes
			$	(1.7	)		Earnings from continuing operations
	Defined benefit pension items:
Amortization of:
Prior-service gains		$	(0.2	)		(a)
Actuarial losses		1.5				(a)
		1.3				Earnings from continuing operations
Total reclassifications for the period		$	(0.4	)		Earnings from continuing operations
(a) These accumulated other comprehensive income components are included in the computation of net periodic pension cost and net periodic postretirement benefit cost (see Note 9 for additional details).
The reclassifications out of Accumulated other comprehensive income (loss) for the three months ended March 31, 2014 were as follows:
		Amount Reclassified from Accumulated Other Comprehensive Income
In millions		Three months ended				Statement of Comprehensive Income Line Item
Reclasses below represent (Income) loss to the Statement of Comprehensive Income
Gains on cash flow hedges:
Foreign exchange contracts		$	(0.4	)		Cost of goods sold
		(0.4		)		Earnings before income taxes
		—				Provision for income taxes
		$	(0.4	)		Earnings from continuing operations
Defined benefit pension items:
Amortization of:
Prior-service gains		$	(0.7	)		(a)
		(0.7		)		Earnings from continuing operations
Total reclassifications for the period		$	(1.1	)		Earnings from continuing operations
(a) These accumulated other comprehensive income components are included in the computation of net periodic pension cost and net periodic postretirement benefit cost (see Note 9 for additional details).

ShareBased_Compensation

Share-Based Compensation	3 Months Ended
	Mar. 31, 2015
Share-based Compensation [Abstract]
Share-Based Compensation	Share-Based Compensation
	The Company records share-based compensation awards using a fair value method and recognizes compensation expense for an amount equal to the fair value of the share-based payment issued in its financial statements. The Company’s share-based compensation plans include programs for stock options, restricted stock units (RSUs), performance share units (PSUs) and deferred compensation.
	Compensation Expense
	Share-based compensation expense relates to continuing operations and is included in Selling and administrative expenses. The expenses recognized for the three months ended March 31 were as follows:
	In millions	2015				2014
	Stock options	$	1			$	1.1
	RSUs	1.6				1.9
	PSUs	1				0.3
	Deferred compensation	0.4				0.2
	Pre-tax expense	4				3.5
	Tax benefit	(1.3		)		(1.3		)
	After-tax expense	$	2.7			$	2.2
	Stock Options/RSUs
	Eligible participants may receive (i) stock options, (ii) RSUs or (iii) a combination of both stock options and RSUs. Grants issued during the three months ended March 31 were as follows:
		2015							2014
		Number			Weighted-				Number	Weighted-
		granted			average fair				granted	average fair
					value per award					value per award
	Stock options	220,679			$	17.88			185,297	$	19.56
	RSUs	80,913			$	57.85			77,499	$	54.13
	The fair value of each of the Company's stock option and RSU awards is expensed on a straight-line basis over the required service period, which is generally the 3-year vesting period. However, for stock options and RSUs granted to retirement eligible employees, the Company recognizes expense for the fair value at the grant date.
	The average fair value of the stock options granted is determined using the Black-Scholes option-pricing model. The following assumptions were used during the three months ended March 31:
		2015			2014
	Dividend yield	0.69	%		0.6	%
	Volatility	34.02	%		36.55	%
	Risk-free rate of return	1.78	%		1.94	%
	Expected life	6.0 years			6.0 years
	Expected volatility is based on the weighted average of the implied volatility of a group of the Company’s peers due to the lack of trading history for the Company's ordinary shares. The risk-free rate of return is based on the yield curve of a zero-coupon U.S. Treasury bond on the date the award is granted with a maturity equal to the expected life of the award. Historical peer data is used to estimate forfeitures within the Company’s valuation model. The expected life of the Company’s stock option awards is derived from the simplified approach based on the weighted average time to vest and the remaining contractual term and represents the period of time that awards are expected to be outstanding.
	Performance Shares
	The Company has a Performance Share Program for key employees. The program provides awards in the form of PSUs based on performance against pre-established objectives. The annual target award level is expressed as a number of the Company's ordinary shares. All PSUs are settled in the form of ordinary shares unless deferred. During the three months ended March 31, 2015, the Company granted PSUs with a maximum award level of approximately 0.1 million shares.
	In March 2014, the Company’s Compensation Committee granted PSUs that were based 50% upon a performance condition, measured at each performance period by earnings per share ("EPS") growth, and 50% upon a market condition, measured by the Company’s relative TSR as compared to the TSR of the industrial group of companies in the S&P 400 Capital Goods Index over the one-year, two-year, and three-year performance periods. The fair values of the market condition were estimated using a Monte Carlo Simulation approach in a risk-neutral framework based upon historical volatility, risk-free rates and correlation matrix.
	In March 2015, the Company's Compensation Committee granted PSU's that were based 50% upon a performance condition, measured at the end of the performance period by EPS growth, and 50% upon a market condition, measured by the Company’s relative TSR as compared to the TSR of the industrial group of companies in the S&P 400 Capital Goods Index over the three-year performance period. The fair value of the market condition was estimated using a Monte Carlo Simulation approach in a risk-neutral framework based upon historical volatility, risk-free rates and correlation matrix.
	Deferred Compensation
	The Company allows key employees to defer a portion of their eligible compensation into a number of investment choices including its ordinary share equivalents. Any amounts invested in ordinary share equivalents will be settled in ordinary shares of the Company at the time of distribution.

Restructuring_Activities

Restructuring Activities	3 Months Ended
	Mar. 31, 2015
Restructuring Charges [Abstract]
Restructuring Activities	Restructuring Activities
	As of March 31, 2015 the Company had an immaterial amount accrued for restructuring actions. As of December 31, 2014, the Company had $1.9 million accrued for costs associated with its ongoing restructuring actions related to a plan put in place in the second quarter of 2014 to restructure the EMEIA segment in order to improve efficiencies and regional cost structure.

Other_Net

Other, Net	3 Months Ended
	Mar. 31, 2015
Other Net [Abstract]
Other, Net	The components of Other, net for the three months ended March 31 were as follows:
		Three months ended
	In millions	2015			2014
	Interest income	$	(0.3	)	$	(0.2	)
	Exchange loss	3.3			0.1
	Other	0.1			—
	Other (gain) loss, net	$	3.1		$	(0.1	)
	In February 2015, the Venezuelan government announced changes to its exchange rate system that included the launch of a new, market-based system called the Marginal Currency System, or “SIMADI.” During the three months ended March 31, 2015 the Company recorded a charge of $2.8 million in order to remeasure net monetary assets at the SIMADI rate. This loss is within Exchange loss in the table above.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The effective income tax rates for the three months ended March 31, 2015 and 2014 were 22.0% and 29.9%. The decrease in the effective income tax rate compared to 2014 is primarily due to favorable changes in the mix of income earned in lower rate jurisdictions.

Earnings_Per_Share_EPS

Earnings Per Share (EPS)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share (EPS)	Earnings Per Share (EPS)
	Basic EPS is calculated by dividing Net earnings attributable to Allegion plc by the weighted-average number of ordinary shares outstanding for the applicable period. Diluted EPS is calculated after adjusting the denominator of the basic EPS calculation for the effect of all potentially dilutive ordinary shares, which in the Company’s case, includes shares issuable under share-based compensation plans.
	The following table summarizes the weighted-average number of ordinary shares outstanding for basic and diluted earnings per share calculations for the three months ended March 31:
		Three months ended
	In millions	2015	2014
	Weighted-average number of basic shares	95.9	96.3
	Shares issuable under incentive stock plans	1	1.1
	Weighted-average number of diluted shares	96.9	97.4
	At March 31, 2015, $0.3 million stock options were excluded from the computation of weighted average diluted shares outstanding because the effect of including these shares would have been anti-dilutive.

Business_Segment_Information

Business Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Business Segment Information	Business Segment Information
	The Company classifies its businesses into the following three reportable segments based on industry and market focus: Americas, EMEIA and Asia Pacific.
	Segment operating income is the measure of profit and loss that the Company’s chief operating decision maker uses 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 and loss. The Company’s chief operating decision maker 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 and loss upon which to base its operating decisions. The Company defines Segment operating margin as Segment operating income as a percentage of Net revenues.
	In the second quarter of 2014 management committed to a plan to sell a component of a business in the EMEIA region and reclassified historical results of the component to discontinued operations for all periods presented. The transaction closed in the third quarter of 2014.
	A summary of operations by reportable segment for the three months ended March 31 was as follows:
		Three months ended
	In millions	2015			2014
	Net revenues
	Americas	$	354.3		$	345.4
	EMEIA	81.7			99.2
	Asia Pacific	22.7			22
	Total	$	458.7		$	466.6
	Segment operating income (loss)
	Americas	$	84.2		$	86.4
	EMEIA	2.6			(0.6		)
	Asia Pacific	(2.6		)	(3.0		)
	Total	84.2			82.8
	Reconciliation to Operating income
	Unallocated corporate expense	(13.2		)	(15.0		)
	Operating income	$	71		$	67.8
	Reconciliation to Earnings before income taxes
	Interest expense	11.6			13.1
	Other (gain) loss, net	3.1			(0.1		)
	Earnings before income taxes	$	56.3		$	54.8

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	The Company is involved in various litigations, claims and administrative proceedings, including those related to environmental and product warranty matters. Amounts recorded for identified contingent liabilities are estimates, which are reviewed periodically and adjusted to reflect additional information when it becomes available. Subject to the uncertainties inherent in estimating future costs for contingent liabilities, except as expressly set forth in this note, management believes that any liability which may result from these legal matters would not have a material adverse effect on the financial condition, results of operations, liquidity or cash flows of the Company.
	Environmental Matters
	The Company is dedicated to an environmental program to reduce the utilization and generation of hazardous materials during the manufacturing process and to remediate identified environmental concerns. As to the latter, the Company is currently engaged in site investigations and remediation activities to address environmental cleanup from past operations at current and former production facilities.
	The Company is sometimes a party to environmental lawsuits and claims and from time to time receives notices of potential violations of environmental laws and regulations from the U.S. Environmental Protection Agency and similar state authorities. It has also been identified as a potentially responsible party ("PRP") for cleanup costs associated with off-site waste disposal at federal Superfund and state remediation sites. For all such sites, there are other PRPs and, in most instances, the Company’s involvement is minimal.
	In estimating its liability, the Company has assumed it will not bear the entire cost of remediation of any site to the exclusion of other PRPs who may be jointly and severally liable. The ability of other PRPs to participate has been taken into account, based on our understanding of the parties’ financial condition and probable contributions on a per site basis. Additional lawsuits and claims involving environmental matters are likely to arise from time to time in the future.
	During the three months ended March 31, 2015 and 2014, the Company incurred $1.8 million and $0.8 million of expenses for environmental remediation at sites presently or formerly owned or leased by us. As of March 31, 2015 and December 31, 2014, the Company has recorded reserves for environmental matters of $9.4 million and $8.8 million. Of these amounts, $2.8 million and $2.4 million relate to remediation of sites previously disposed by the Company. Environmental reserves are classified as Accrued expenses and other current liabilities or Other noncurrent liabilities based on their expected term. The Company's total current environmental reserve at March 31, 2015 and December 31, 2014 was $2.7 million and $2.2 million and the remainder is classified as non-current. Given the evolving nature of environmental laws, regulations and technology, the ultimate cost of future compliance is uncertain.
	Warranty Liability
	Standard product warranty accruals are recorded at the time of sale and are estimated based upon product warranty terms and historical experience. The Company assesses the adequacy of its liabilities and will make adjustments as necessary based on known or anticipated warranty claims, or as new information becomes available.
	The changes in the standard product warranty liability for the three months ended March 31 were as follows:
	In millions	2015			2014
	Balance at beginning of period	$	10.3		$	9.8
	Reductions for payments	(1.3		)	(1.6		)
	Accruals for warranties issued during the current period	1.2			1.8
	Changes to accruals related to preexisting warranties	—			(0.7		)
	Translation	(0.2		)	—
	Balance at end of period	$	10		$	9.3
	Standard product warranty liabilities are classified as Accrued expenses and other current liabilities.

Guarantor_Financial_Informatio

Guarantor Financial Information (Notes)	3 Months Ended
	Mar. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	Guarantor Financial Information
	Allegion US Holding Company, Inc. (the “Issuer”) as the issuer of the Senior Notes and Allegion plc (the “Parent”), Schlage Lock Company LLC and Von Duprin LLC (together, the “Subsidiary Guarantors”) are all guarantors of the Senior Notes. The following condensed and consolidated financial information of the Parent, the Issuer, the Subsidiary Guarantors and the other Allegion subsidiaries that are not guarantors (the “Other Subsidiaries”) on a combined basis as of March 31, 2015 and for the three months ended March 31, 2015 and 2014, is being presented in order to meet the reporting requirements under the Senior Notes indenture and Rule 3-10 of Regulation S-X. In accordance with Rule 3-10(d) of Regulation S-X, separate financial statements for the Issuer, the Parent and the Subsidiary Guarantors are not required to be filed with the SEC as the subsidiary debt issuer and the guarantors are directly or indirectly 100% owned by the Parent and the guarantees are full and unconditional and joint and several.
	The Company revised its Condensed and Consolidated Statement of Comprehensive Income for the three months ended March 31, 2014 to correct for an immaterial error. The revision was made to properly separate $75.3 million of Intercompany interest expense (income) incurred (earned) in the first quarter of 2014 on intercompany notes payable (receivable) between certain Subsidiary Guarantors and Other Subsidiaries from Equity earnings (loss) in affiliates, net of tax for Condensed and Consolidated Statement of Comprehensive Income for the three months ended March 31, 2014. The revisions did not impact Earnings (loss) from continuing operations for the Issuer, Parent, Other Subsidiaries or Allegion plc and solely impact the first quarter 2014 financial reporting.
	Condensed and Consolidated Statement of Comprehensive Income
	For the three months ended March 31, 2015
	In millions	Parent			Issuer			Subsidiary Guarantors			Other			Consolidating			Allegion plc
											Subsidiaries			Adjustments
	Net revenues	$	—		$	—		$	341.1		$	163.8		$	(46.2	)	$	458.7
	Cost of goods sold	—			—			198.3			119.5			(46.2		)	271.6
	Selling and administrative expenses	0.9			—			72.8			42.4			—			116.1
	Operating income (loss)	(0.9		)	—			70			1.9			—			71
	Equity earnings (loss) in affiliates, net of tax	52.7			10			0.5			48.2			(111.4		)	—
	Interest expense	6.5			5.1			—			—			—			11.6
	Intercompany interest and fees	—			(23.5		)	9.1			14.4			—			—
	Other (gain) loss, net	(0.1		)	(0.2		)	0.4			3			—			3.1
	Earnings (loss) before income taxes	45.4			(18.4		)	79.2			61.5			(111.4		)	56.3
	Provision (benefit) for income taxes	—			(10.9		)	30.3			(7.0		)	—			12.4
	Earnings (loss) from continuing operations	45.4			(7.5		)	48.9			68.5			(111.4		)	43.9
	Discontinued operations, net of tax	—			—			(0.2		)	—			—			(0.2		)
	Net earnings (loss)	45.4			(7.5		)	48.7			68.5			(111.4		)	43.7
	Less: Net loss attributable to noncontrolling interests	—			—			—			(1.7		)	—			(1.7		)
	Net earnings (loss) attributable to Allegion plc	$	45.4		$	(7.5	)	$	48.7		$	70.2		$	(111.4	)	$	45.4
	Total comprehensive income (loss)	$	15		$	(8.8	)	$	52.6		$	35.4		$	(80.9	)	$	13.3
	Less: Total comprehensive income attributable to noncontrolling interests	—			—			—			(1.7		)	—			(1.7		)
	Total comprehensive income (loss) attributable to Allegion plc	$	15		$	(8.8	)	$	52.6		$	37.1		$	(80.9	)	$	15
	Condensed and Consolidated Statement of Comprehensive Income
	For the three months ended March 31, 2014
	In millions	Parent			Issuer			Subsidiary Guarantors			Other			Consolidating			Allegion plc
											Subsidiaries			Adjustments
	Net revenues	$	—		$	—		$	312.6		$	196.4		$	(42.4	)	$	466.6
	Cost of goods sold	—			—			178.3			138.5			(42.4		)	274.4
	Selling and administrative expenses	1			—			69.7			53.7			—			124.4
	Operating income (loss)	(1.0		)	—			64.6			4.2			—			67.8
	Equity earnings (loss) in affiliates, net of tax	36.8			38			0.6			87.6			(163.0		)	—
	Interest expense	—			12.4			—			0.7			—			13.1
	Intercompany interest and fees	—			(12.4		)	75.3			(62.9		)	—			—
	Other (gain) loss, net	—			—			(0.1		)	—			—			(0.1		)
	Earnings (loss) before income taxes	35.8			13.2			140.6			28.2			(163.0		)	54.8
	Provision (benefit) for income taxes	—			(9.3		)	52.5			(26.8		)	—			16.4
	Earnings (loss) from continuing operations	35.8			22.5			88.1			55			(163.0		)	38.4
	Discontinued operations, net of tax	—			—			—			(0.8		)	—			(0.8		)
	Net earnings (loss)	35.8			22.5			88.1			54.2			(163.0		)	37.6
	Less: Net earnings attributable to noncontrolling interests	—			—			—			1.8			—			1.8
	Net earnings (loss) attributable to Allegion plc	$	35.8		$	22.5		$	88.1		$	52.4		$	(163.0	)	$	35.8
	Total comprehensive income (loss)	$	22.6		$	22.5		$	87.9		$	53.5		$	(162.9	)	$	23.6
	Less: Total comprehensive income attributable to noncontrolling interests	—			—			—			1			—			1
	Total comprehensive income (loss) attributable to Allegion plc	$	22.6		$	22.5		$	87.9		$	52.5		$	(162.9	)	$	22.6
	Condensed and Consolidated Balance Sheet
	March 31, 2015
	In millions	Parent			Issuer			Subsidiary Guarantors			Other			Consolidating			Allegion plc
											Subsidiaries			Adjustments
	Current assets:
	Cash and cash equivalents	$	5		$	8.8		$	65.7		$	150.1		$	—		$	229.6
	Accounts and notes receivable, net	—			—			126			129.8			—			255.8
	Inventories	—			—			106.6			78.3			—			184.9
	Other current assets	0.4			10.8			28.4			193.8			—			233.4
	Accounts and notes receivable affiliates	—			66.3			334.2			320.8			(721.3		)	—
	Total current assets	5.4			85.9			660.9			872.8			(721.3		)	903.7
	Investment in affiliates	912.3			2,295.60			90.5			4,255.90			(7,554.3		)	—
	Property, plant and equipment, net	—			—			148.8			57.5			—			206.3
	Intangible assets, net	—			—			161			449.3			—			610.3
	Notes receivable affiliates	—			1,191.90			3,727.50			1,750.60			(6,670.0		)	—
	Other noncurrent assets	15.1			10.6			69.8			111.6			—			207.1
	Total assets	$	932.8		$	3,584.00		$	4,858.50		$	7,497.70		$	(14,945.6	)	$	1,927.40
Current liabilities:
Accounts payable and accruals	$	1.9		$	9.1		$	195.2		$	226.5		$	—		$	432.7
Short-term borrowings and current maturities of long-term debt	48.8			—			0.1			0.5			—			49.4
Accounts and note payable affiliates	—			141			323.1			257.2			(721.3		)	—
Total current liabilities	50.7			150.1			518.4			484.2			(721.3		)	482.1
Long-term debt	901.9			300			0.1			0.7			—			1,202.70
Note payable affiliate	—			2,762.50			—			3,907.50			(6,670.0		)	—
Other noncurrent liabilities	—			7.3			210.5			23.3			—			241.1
Total liabilities	952.6			3,219.90			729			4,415.70			(7,391.3		)	1,925.90
Equity:
Total shareholders equity (deficit)	(19.8		)	364.1			4,129.50			3,060.70			(7,554.3		)	(19.8		)
Noncontrolling interests	—			—			—			21.3			—			21.3
Total equity (deficit)	(19.8		)	364.1			4,129.50			3,082.00			(7,554.3		)	1.5
Total liabilities and equity	$	932.8		$	3,584.00		$	4,858.50		$	7,497.70		$	(14,945.6	)	$	1,927.40
Condensed and Consolidated Balance Sheet
December 31, 2014
In millions	Parent			Issuer			Subsidiary Guarantors			Other			Consolidating			Allegion plc
										Subsidiaries			Adjustments
Current assets:
Cash and cash equivalents	$	27.1		$	0.5		$	126.3		$	136.6		$	—		$	290.5
Accounts and notes receivable, net	—			—			115.7			144.2			—			259.9
Inventories	—			—			101.1			78.4			—			179.5
Other current assets	0.4			46.6			15.6			181.3			—			243.9
Accounts receivable affiliates	0.1			15.2			256.4			259.4			(531.1		)	—
Total current assets	27.6			62.3			615.1			799.9			(531.1		)	973.8
Investment in affiliates	917.4			2,336.70			90.6			4,774.70			(8,119.4		)	—
Property, plant and equipment, net	—			—			147.3			63.9			—			211.2
Intangible assets, net	—			—			161.1			470.6			—			631.7
Notes receivable affiliates	—			1,191.90			3,731.20			1,762.90			(6,686.0		)	—
Other noncurrent assets	16.3			10.6			62.3			110			—			199.2
Total assets	$	961.3		$	3,601.50		$	4,807.60		$	7,982.00		$	(15,336.5	)	$	2,015.90
Current liabilities:
Accounts payable and accruals	$	2.8		$	51.3		$	380.8		$	46.8		$	—		$	481.7
Short-term borrowings and current maturities of long-term debt	48.8			—			0.1			0.7			—			49.6
Accounts and note payable affiliates	0.4			101.1			245			184.6			(531.1		)	—
Total current liabilities	52			152.4			625.9			232.1			(531.1		)	531.3
Long-term debt	914.1			300			0.1			0.8			—			1,215.00
Note payable affiliate	—			2,778.40			—			3,907.60			(6,686.0		)	—
Other noncurrent liabilities	—			5.8			206.2			39.1			—			251.1
Total liabilities	966.1			3,236.60			832.2			4,179.60			(7,217.1		)	1,997.40
Equity:
Total shareholders equity (deficit)	(4.8		)	364.9			3,975.40			3,779.10			(8,119.4		)	(4.8		)
Noncontrolling interests	—			—			—			23.3			—			23.3
Total equity (deficit)	(4.8		)	364.9			3,975.40			3,802.40			(8,119.4		)	18.5
Total liabilities and equity	$	961.3		$	3,601.50		$	4,807.60		$	7,982.00		$	(15,336.5	)	$	2,015.90
Condensed and Consolidated Statement of Cash Flows
For the three months ended March 31, 2015
In millions	Parent			Issuer			Subsidiary Guarantors			Other			Consolidating			Allegion plc
										Subsidiaries			Adjustments
Net cash provided by (used in) continuing operating activities	$	24.4		$	20.5		$	(44.7	)	$	65.2		$	(60.8	)	$	4.6
Net cash provided by (used in) discontinued operating activities	—			—			—			(0.2		)	—			(0.2		)
Net cash provided by (used in) operating activities	24.4			20.5			(44.7		)	65			(60.8		)	4.4
Cash flows from investing activities:
Capital expenditures	—			—			(7.8		)	(1.6		)	—			(9.4		)
Acquisition of businesses, net of cash acquired	—			—			(9.0		)	—			—			(9.0		)
Other investing activities, net	—			—			4			—			—			4
Net cash provided by (used in) investing activities	—			—			(12.8		)	(1.6		)	—			(14.4		)
Cash flows from financing activities:
Debt repayments	(12.2		)	—			—			(0.2		)	—			(12.4		)
Net inter-company proceeds (payments)	—			(12.2		)	—			12.2			—			—
Dividends (paid) received	—			—			(3.1		)	(57.7		)	60.8			—
Dividends paid to shareholders	(9.5		)	—			—			—			—			(9.5		)
Repurchase of ordinary shares	(30.0		)	—			—			—			—			(30.0		)
Other financing activities, net	5.2			—			—			—			—			5.2
Net cash provided by (used in) financing activities	(46.5		)	(12.2		)	(3.1		)	(45.7		)	60.8			(46.7		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(4.2		)	—			(4.2		)
Net increase (decrease) in cash and cash equivalents	(22.1		)	8.3			(60.6		)	13.5			—			(60.9		)
Cash and cash equivalents - beginning of period	27.1			0.5			126.3			136.6			—			290.5
Cash and cash equivalents - end of period	$	5		$	8.8		$	65.7		$	150.1		$	—		$	229.6
Condensed and Consolidated Statement of Cash Flows
For the three months ended March 31, 2014
In millions	Parent			Issuer			Subsidiary Guarantors			Other			Consolidating			Allegion plc
										Subsidiaries			Adjustments
Net cash provided by (used in) continuing operating activities	$	(3.2	)	$	7.5		$	17.4		$	(21.7	)	$	—		$	—
Net cash provided by (used in) discontinued operating activities	—			—			—			(0.9		)	—			(0.9		)
Net cash provided by (used in) operating activities	(3.2		)	7.5			17.4			(22.6		)	—			(0.9		)
Cash flows from investing activities:
Capital expenditures	—			—			(6.8		)	(2.4		)	—			(9.2		)
Acquisition of businesses, net of cash acquired	—			—			—			(5.3		)	—			(5.3		)
Proceeds from sale of property, plant and equipment	—			—			0.2			—			—			0.2
Net cash provided by (used in) investing activities	—			—			(6.6		)	(7.7		)	—			(14.3		)
Cash flows from financing activities:
Debt repayments	—			(7.5		)	—			(0.5		)	—			(8.0		)
Net inter-company proceeds (payments)	0.5			—			(29.9		)	29.4			—			—
Dividends paid	(7.2		)	—			—			—			—			(7.2		)
Other, net	11.8			—			—			—			—			11.8
Net cash provided by (used in) financing activities	5.1			(7.5		)	(29.9		)	28.9			—			(3.4		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(3.4		)	—			(3.4		)
Net increase (decrease) in cash and cash equivalents	1.9			—			(19.1		)	(4.8		)	—			(22.0		)
Cash and cash equivalents - beginning of period	1.4			—			78.8			147.2			—			227.4
Cash and cash equivalents - end of period	$	3.3		$	—		$	59.7		$	142.4		$	—		$	205.4

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events
	On April 1, 2015, the Company completed the acquisition of certain assets of Zero International, Inc ("Zero"). Zero manufactures door and window products for commercial spaces and products include sealing systems, such as sound control, fire and smoke protection, threshold applications, lites, door louvers, intumescent products, photo-luminescent and flood barrier for doors.
	On April 8, 2015, the Company's Board of Directors declared a quarterly dividend of $0.10 cents per ordinary share. The dividend is payable June 30, 2015 to shareholders of record on June 16, 2015.
	On April 24, 2015, the Company signed a definitive agreement to acquire the assets of Brio, a division of RMD Industries Pty Ltd. Brio is a designer and manufacturer of sliding and folding door hardware for commercial and residential spaces in Australia, New Zealand, the United Kingdom and the United States. The Company expects the transaction to close in the second quarter of 2015.

Discontinued_Operations_Notes

Discontinued Operations (Notes)	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	Discontinued Operations
	EMEIA Divestiture
	In the second quarter of 2014 the Company committed to a plan to sell its United Kingdom (UK) Door businesses to an unrelated third party. The transaction closed in the third quarter of 2014. The businesses sold include the Dor-o-Matic™ branded automatic door business, the Martin Roberts™ branded performance steel doorset business and the UK service organization. Historical results of the component have been reclassified to discontinued operations for all periods presented.
	Net revenues and after-tax earnings of the component for the three months ended March 31 were as follows:
	In millions	2015			2014
	Net revenues	$	—		$	5.8
	After-tax loss from operations	$	(0.1	)	$	(0.6	)
	Discontinued operations, net of tax	$	(0.1	)	$	(0.6	)
	Other divestitures
	Other discontinued operations recognized losses of $0.1 million and $0.2 million for the three months ended March 31, 2015 and 2014. These losses were mainly related to lease expense and other miscellaneous expenses from previously sold businesses.

Recent_Accounting_Pronouncemen1

Recent Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements:
	In April 2014, the FASB issued ASU 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity," which amends the definition of a discontinued operation in Accounting Standards Codification Topic 205-20 (Presentation of Financial Statements — Discontinued Operations) and requires entities to disclose additional information about disposal transactions that do not meet the discontinued operations criteria. ASU 2014-08 redefines a discontinued operation as a component or group of components of an entity that (1) has been disposed of by sale or other than by sale or is classified as held for sale and (2) represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results. According to the ASU, a strategic shift that has (or will have) a major effect on an entity’s operations and results includes the disposal of a major geographical area, a major line of business, a major equity investment, or other major parts of an entity. The ASU is effective prospectively for disposals or components classified as held for sale in periods on or after December 15, 2014. The adoption of ASU 2014-08 did not have a significant impact on the Condensed and Consolidated Financial Statements.

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Mar. 31, 2015
Inventory, Net [Abstract]
Major Classes Of Inventory	The major classes of inventory were as follows:
	In millions	March 31,		December 31,
		2015		2014
	Raw materials	$	59.7	$	54.8
	Work-in-process	34.7		32.1
	Finished goods	90.5		92.6
	Total	$	184.9	$	179.5

Goodwill_Tables

Goodwill (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill Disclosure [Abstract]
Changes in Goodwill Carrying Amounts	The changes in the carrying amount of goodwill for the three months ended March 31, 2015 were as follows:
	In millions	Americas			EMEIA			Asia Pacific			Total
	December 31, 2014 (gross)	$	364.8		$	533.1		$	93.6		$	991.5
	Accumulated impairment	—			(478.6		)	(6.9		)	(485.5		)
	December 31, 2014 (net)	364.8			54.5			86.7			506
	Currency translation	(0.1		)	(5.6		)	(1.7		)	(7.4		)
	March 31, 2015 Goodwill (net)	$	364.7		$	48.9		$	85		$	498.6

Intangible_Assets_Tables

Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Intangible Assets Disclosure [Abstract]
Schedule of Intangible Asset Net of Goodwill	The gross amount of the Company’s intangible assets and related accumulated amortization were as follows:
		March 31, 2015							December 31, 2014
	In millions	Gross carrying amount		Accumulated amortization			Net carrying amount		Gross carrying amount		Accumulated amortization			Net carrying amount
	Completed technologies/patents	$	26.3	$	(22.1	)	$	4.2	$	27.8	$	(23.2	)	$	4.6
	Customer relationships	84.4		(33.8		)	50.6		94.7		(37.0		)	57.7
	Trademarks (finite-lived)	79.7		(32.9		)	46.8		89.3		(36.0		)	53.3
	Other	10		(10.0		)	—		10.8		(10.8		)	—
	Total finite-lived intangible assets	200.4		$	(98.8	)	101.6		222.6		$	(107.0	)	115.6
	Trademarks (indefinite-lived)	10.1					10.1		10.1					10.1
	Total	$	210.5				$	111.7	$	232.7				$	125.7

Debt_and_Credit_Facilities_Tab

Debt and Credit Facilities (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Schedule of Debt	Long-term debt and other borrowings consisted of the following:
	In millions	March 31,		December 31,
		2015		2014
	Term Loan Facility due 2019	$	950.6	$	962.8
	5.75% Senior notes due 2021	300		300
	Other debt, including capital leases, maturing in various amounts through 2016	1.5		1.8
	Total debt	1,252.10		1,264.60
	Less: current portion of long term debt	49.4		49.6
		$	1,202.70	$	1,215.00

Financial_Instruments_Tables

Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of the Fair Values of Derivative Instruments	The fair values of derivative instruments included within the Condensed and Consolidated Balance Sheets were as follows:
		Asset derivatives					Liability derivatives
	In millions	March 31,			December 31,		March 31,				December 31,
		2015			2014		2015				2014
	Derivatives designated as hedges:
	Currency derivatives	$	3.4		$	2.1	$	—			$	—
	Interest rate swaps	—			—		2.3				0.9
	Derivatives not designated as hedges:
	Currency derivatives	9.4			2.2		32.4				13.9
	Total derivatives	$	12.8		$	4.3	$	34.7			$	14.8
Schedule of Derivatives Designated as Hedges Affecting Net Earning and AOCI	The amounts associated with derivatives designated as hedges affecting Net earnings and Accumulated other comprehensive loss for the three months ended March 31 were as follows:
		Amount of gain (loss)					Location of gain		Amount of gain (loss) reclassified from Accumulated other comprehensive loss and
		recognized in Accumulated other comprehensive loss					(loss) recognized		recognized into Net earnings
	In millions	2015			2014		in Net earnings		2015				2014
	Currency derivatives	$	3.3		$	0.7	Cost of goods sold		$	1.7			$	(0.4	)
	Interest rate swaps	(1.4		)	—		Interest expense		—				—
	Total	$	1.9		$	0.7			$	1.7			$	(0.4	)

Pensions_and_Postretirement_Be1

Pensions and Postretirement Benefits Other than Pensions (Tables)	3 Months Ended
	Mar. 31, 2015
Pension Plans [Member]
Schedule of Net Periodic Benefit Cost	The components of the Company’s net periodic pension benefit costs for the three months ended March 31 were as follows:
		U.S.
	In millions	2015			2014
	Service cost	$	2.4		$	1.8
	Interest cost	2.7			2.8
	Expected return on plan assets	(2.8		)	(2.8		)
	Net amortization of:
	Prior service costs	0.2			0.2
	Plan net actuarial losses	1.1			0.5
	Net periodic pension benefit cost	3.6			2.5
	Net settlement losses	0.6			—
	Net periodic pension benefit cost after settlement losses	$	4.2		$	2.5
		Non-U.S.
	In millions	2015			2014
	Service cost	$	0.8		$	1.2
	Interest cost	3.4			4.3
	Expected return on plan assets	(4.4		)	(4.3		)
	Amortization of plan net actuarial losses	0.4			0.7
	Net periodic pension benefit cost	$	0.2		$	1.9
Other Postretirement Benefit Plans [Member]
Schedule of Net Periodic Benefit Cost	The components of net periodic postretirement benefit income for the three months ended March 31 were as follows:
	In millions	2015			2014
	Service cost	$	—		$	0.1
	Interest cost	0.1			0.1
	Amortization of prior service gains	(0.4		)	(0.4		)
	Net periodic postretirement benefit income	$	(0.3	)	$	(0.2	)

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis	Assets and liabilities measured at fair value at March 31, 2015 were as follows:
		Fair value measurements						Total
	In millions	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		fair value
	Recurring fair value measurements
	Assets:
	Marketable securities	$	23	$	—	$	—	$	23
	Foreign currency contracts	—		12.8		—		12.8
	Total asset recurring fair value measurements	23		$	12.8	$	—	$	35.8
	Liabilities:
	Foreign currency contracts	$	—	$	32.4	$	—	$	32.4
	Interest rate swap	—		2.3		—		2.3
	Total liability recurring fair value measurements	$	—	$	34.7	$	—	$	34.7
	Financial instruments not carried at fair value
	Total debt	—		1,265.40		—		1,265.40
	Total financial instruments not carried at fair value	$	—	$	1,265.40	$	—	$	1,265.40
	Assets and liabilities measured at fair value at December 31, 2014 were as follows:
		Fair value measurements						Total
	In millions	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		fair value
	Recurring fair value measurements
	Assets:
	Marketable securities	$	17.9	$	—	$	—	$	17.9
	Foreign currency contracts	—		4.3		—		4.3
	Total asset recurring fair value measurements	$	17.9	$	4.3	$	—	$	22.2
	Liabilities:
	Foreign currency contracts	$	—	$	13.9	$	—	$	13.9
	Interest rate swap	—		0.9		—		0.9
	Total liability recurring fair value measurements	$	—	$	14.8	$	—	$	14.8
	Financial instruments not carried at fair value
	Total debt	—		1,279.40		—		1,279.40
	Total financial instruments not carried at fair value	$	—	$	1,279.40	$	—	$	1,279.40

Equity_Tables

Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Stockholders' Equity Note [Abstract]
Reconciliation of Ordinary Shares	The reconciliation of Ordinary shares is as follows:
	In millions	Total
	December 31, 2014	95.8
	Shares issued under incentive plans, net	0.3
	Repurchase of ordinary shares	(0.5	)
	March 31, 2015	95.6
Components Of Shareholders Equity Rollforward	The components of Equity for the three months ended March 31, 2015 were as follows:
	In millions	Allegion plc				Noncontrolling				Total
		shareholders’				interests				equity
		equity
	Balance at December 31, 2014	$	(4.8	)		$	23.3			$	18.5
	Net earnings	45.4				(1.7		)		43.7
	Currency translation	(38.9		)		0				(38.9		)
	Change in value of marketable securities and derivatives qualifying as cash flow hedges, net of tax	4.6				—				4.6
	Pension and OPEB adjustments, net of tax	3.9				—				3.9
	Total comprehensive income	15				(1.7		)		13.3
	Share-based compensation	3.6				—				3.6
	Dividends to noncontrolling interests	—				(0.3		)		(0.3		)
	Dividends to ordinary shareholders	(9.6		)		—				(9.6		)
	Repurchase of ordinary shares	(30.0		)		—				(30.0		)
	Shares issued under incentive plans, net	6				—				6
	Balance at March 31, 2015	$	(19.8	)		$	21.3			$	1.5
	The components of Equity for the three months ended March 31, 2014 were as follows:
	In millions	Allegion plc				Noncontrolling				Total
		shareholders’				interests				equity
		equity
	Balance at December 31, 2013	$	(66.1	)		$	31.1			$	(35.0	)
	Net earnings	35.8				1.8				37.6
	Currency translation	(12.1		)		(0.8		)		(12.9		)
	Change in value of marketable securities and derivatives qualifying as cash flow hedges, net of tax	(0.4		)		—				(0.4		)
	Pension and OPEB adjustments, net of tax	(0.7		)		—				(0.7		)
	Total comprehensive income	22.6				1				23.6
	Share-based compensation	3.4				—				3.4
	Dividends to ordinary shareholders	(7.7		)		—				(7.7		)
	Shares issued under incentive plans, net	11.8				—				11.8
	Other	(3.5		)		—				(3.5		)
	Balance at March 31, 2014	$	(39.5	)		$	32.1			$	(7.4	)
Schedule of Accumulated Other Comprehensive Income (Loss)	The changes in Accumulated other comprehensive income (loss) for the three months ended March 31, 2015 are as follows:
	In millions		Cash flow hedges and marketable securities				Pension and OPEB Items				Foreign Currency Items			Total
	December 31, 2014		$	15.7			$	(116.1	)		$	(47.8	)	$	(148.2	)
	Other comprehensive income before reclassifications		6.6				2.7				(38.9		)	(29.6		)
	Amounts reclassified from accumulated other comprehensive income		(1.7		)		1.3				—			(0.4		)
	Tax (expense) benefit		(0.4		)		(0.1		)		—			(0.5		)
	March 31, 2015		$	20.2			$	(112.2	)		$	(86.7	)	$	(178.7	)
	The changes in Accumulated other comprehensive income (loss) for the three months ended March 31, 2014 are as follows:
	In millions		Cash flow hedges and marketable securities				Pension and OPEB Items				Foreign Currency Items			Total
	December 31, 2013		$	16.7			$	(131.3	)		$	17.9		$	(96.7	)
	Other comprehensive income before reclassifications		0.1				—				(12.1		)	(12.0		)
	Amounts reclassified from accumulated other comprehensive income		(0.4		)		(0.7		)		—			(1.1		)
	Tax (expense) benefit		(0.1		)		—				—			(0.1		)
	March 31, 2014		$	16.3			$	(132.0	)		$	5.8		$	(109.9	)
Disclosure of Reclassification Amount	The reclassifications out of Accumulated other comprehensive income (loss) for the three months ended March 31, 2015 were as follows:
			Amount Reclassified from Accumulated Other Comprehensive Income
	In millions		Three months ended				Statement of Comprehensive Income Line Item
	Reclasses below represent (Income) loss to the Statement of Comprehensive Income
	Gains losses on cash flow hedges:
	Foreign exchange contracts		$	(1.7	)		Cost of goods sold
			(1.7		)		Earnings before income taxes
			—				Provision for income taxes
			$	(1.7	)		Earnings from continuing operations
	Defined benefit pension items:
	Amortization of:
	Prior-service gains		$	(0.2	)		(a)
	Actuarial losses		1.5				(a)
			1.3				Earnings from continuing operations
	Total reclassifications for the period		$	(0.4	)		Earnings from continuing operations
	(a) These accumulated other comprehensive income components are included in the computation of net periodic pension cost and net periodic postretirement benefit cost (see Note 9 for additional details).
	The reclassifications out of Accumulated other comprehensive income (loss) for the three months ended March 31, 2014 were as follows:
			Amount Reclassified from Accumulated Other Comprehensive Income
	In millions		Three months ended				Statement of Comprehensive Income Line Item
	Reclasses below represent (Income) loss to the Statement of Comprehensive Income
	Gains on cash flow hedges:
	Foreign exchange contracts		$	(0.4	)		Cost of goods sold
			(0.4		)		Earnings before income taxes
			—				Provision for income taxes
			$	(0.4	)		Earnings from continuing operations
	Defined benefit pension items:
	Amortization of:
	Prior-service gains		$	(0.7	)		(a)
			(0.7		)		Earnings from continuing operations
	Total reclassifications for the period		$	(1.1	)		Earnings from continuing operations
	(a) These accumulated other comprehensive income components are included in the computation of net periodic pension cost and net periodic postretirement benefit cost (see Note 9 for additional details).

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Share-based Compensation [Abstract]
Share-Based Compensation Expense	The expenses recognized for the three months ended March 31 were as follows:
	In millions	2015				2014
	Stock options	$	1			$	1.1
	RSUs	1.6				1.9
	PSUs	1				0.3
	Deferred compensation	0.4				0.2
	Pre-tax expense	4				3.5
	Tax benefit	(1.3		)		(1.3		)
	After-tax expense	$	2.7			$	2.2
Grants of Stock Options and RSUs	Grants issued during the three months ended March 31 were as follows:
		2015							2014
		Number			Weighted-				Number	Weighted-
		granted			average fair				granted	average fair
					value per award					value per award
	Stock options	220,679			$	17.88			185,297	$	19.56
	RSUs	80,913			$	57.85			77,499	$	54.13
Average fair value of stock options, assumptions	The following assumptions were used during the three months ended March 31:
		2015			2014
	Dividend yield	0.69	%		0.6	%
	Volatility	34.02	%		36.55	%
	Risk-free rate of return	1.78	%		1.94	%
	Expected life	6.0 years			6.0 years

Other_Net_Tables

Other, Net (Tables)	3 Months Ended
	Mar. 31, 2015
Other Net [Abstract]
Other, Net	The components of Other, net for the three months ended March 31 were as follows:
		Three months ended
	In millions	2015			2014
	Interest income	$	(0.3	)	$	(0.2	)
	Exchange loss	3.3			0.1
	Other	0.1			—
	Other (gain) loss, net	$	3.1		$	(0.1	)

Earnings_Per_Share_EPS_Tables

Earnings Per Share (EPS) (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share Basic and Diluted Shares	The following table summarizes the weighted-average number of ordinary shares outstanding for basic and diluted earnings per share calculations for the three months ended March 31:
		Three months ended
	In millions	2015	2014
	Weighted-average number of basic shares	95.9	96.3
	Shares issuable under incentive stock plans	1	1.1
	Weighted-average number of diluted shares	96.9	97.4

Business_Segment_Information_T

Business Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Summary of Operations by Reportable Segments	A summary of operations by reportable segment for the three months ended March 31 was as follows:
		Three months ended
	In millions	2015			2014
	Net revenues
	Americas	$	354.3		$	345.4
	EMEIA	81.7			99.2
	Asia Pacific	22.7			22
	Total	$	458.7		$	466.6
	Segment operating income (loss)
	Americas	$	84.2		$	86.4
	EMEIA	2.6			(0.6		)
	Asia Pacific	(2.6		)	(3.0		)
	Total	84.2			82.8
	Reconciliation to Operating income
	Unallocated corporate expense	(13.2		)	(15.0		)
	Operating income	$	71		$	67.8
	Reconciliation to Earnings before income taxes
	Interest expense	11.6			13.1
	Other (gain) loss, net	3.1			(0.1		)
	Earnings before income taxes	$	56.3		$	54.8

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Product Warranty Liability	The changes in the standard product warranty liability for the three months ended March 31 were as follows:
	In millions	2015			2014
	Balance at beginning of period	$	10.3		$	9.8
	Reductions for payments	(1.3		)	(1.6		)
	Accruals for warranties issued during the current period	1.2			1.8
	Changes to accruals related to preexisting warranties	—			(0.7		)
	Translation	(0.2		)	—
	Balance at end of period	$	10		$	9.3

Guarantor_Financial_Informatio1

Guarantor Financial Information (Tables)	3 Months Ended
	Mar. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Cash Flow Statement [Table Text Block]	Condensed and Consolidated Statement of Cash Flows
	For the three months ended March 31, 2015
	In millions	Parent			Issuer			Subsidiary Guarantors			Other			Consolidating			Allegion plc
											Subsidiaries			Adjustments
	Net cash provided by (used in) continuing operating activities	$	24.4		$	20.5		$	(44.7	)	$	65.2		$	(60.8	)	$	4.6
	Net cash provided by (used in) discontinued operating activities	—			—			—			(0.2		)	—			(0.2		)
	Net cash provided by (used in) operating activities	24.4			20.5			(44.7		)	65			(60.8		)	4.4
	Cash flows from investing activities:
	Capital expenditures	—			—			(7.8		)	(1.6		)	—			(9.4		)
	Acquisition of businesses, net of cash acquired	—			—			(9.0		)	—			—			(9.0		)
	Other investing activities, net	—			—			4			—			—			4
	Net cash provided by (used in) investing activities	—			—			(12.8		)	(1.6		)	—			(14.4		)
	Cash flows from financing activities:
	Debt repayments	(12.2		)	—			—			(0.2		)	—			(12.4		)
	Net inter-company proceeds (payments)	—			(12.2		)	—			12.2			—			—
	Dividends (paid) received	—			—			(3.1		)	(57.7		)	60.8			—
	Dividends paid to shareholders	(9.5		)	—			—			—			—			(9.5		)
	Repurchase of ordinary shares	(30.0		)	—			—			—			—			(30.0		)
	Other financing activities, net	5.2			—			—			—			—			5.2
	Net cash provided by (used in) financing activities	(46.5		)	(12.2		)	(3.1		)	(45.7		)	60.8			(46.7		)
	Effect of exchange rate changes on cash and cash equivalents	—			—			—			(4.2		)	—			(4.2		)
	Net increase (decrease) in cash and cash equivalents	(22.1		)	8.3			(60.6		)	13.5			—			(60.9		)
	Cash and cash equivalents - beginning of period	27.1			0.5			126.3			136.6			—			290.5
	Cash and cash equivalents - end of period	$	5		$	8.8		$	65.7		$	150.1		$	—		$	229.6
	Condensed and Consolidated Statement of Cash Flows
	For the three months ended March 31, 2014
	In millions	Parent			Issuer			Subsidiary Guarantors			Other			Consolidating			Allegion plc
											Subsidiaries			Adjustments
	Net cash provided by (used in) continuing operating activities	$	(3.2	)	$	7.5		$	17.4		$	(21.7	)	$	—		$	—
	Net cash provided by (used in) discontinued operating activities	—			—			—			(0.9		)	—			(0.9		)
	Net cash provided by (used in) operating activities	(3.2		)	7.5			17.4			(22.6		)	—			(0.9		)
	Cash flows from investing activities:
	Capital expenditures	—			—			(6.8		)	(2.4		)	—			(9.2		)
	Acquisition of businesses, net of cash acquired	—			—			—			(5.3		)	—			(5.3		)
	Proceeds from sale of property, plant and equipment	—			—			0.2			—			—			0.2
	Net cash provided by (used in) investing activities	—			—			(6.6		)	(7.7		)	—			(14.3		)
	Cash flows from financing activities:
	Debt repayments	—			(7.5		)	—			(0.5		)	—			(8.0		)
	Net inter-company proceeds (payments)	0.5			—			(29.9		)	29.4			—			—
	Dividends paid	(7.2		)	—			—			—			—			(7.2		)
	Other, net	11.8			—			—			—			—			11.8
	Net cash provided by (used in) financing activities	5.1			(7.5		)	(29.9		)	28.9			—			(3.4		)
	Effect of exchange rate changes on cash and cash equivalents	—			—			—			(3.4		)	—			(3.4		)
	Net increase (decrease) in cash and cash equivalents	1.9			—			(19.1		)	(4.8		)	—			(22.0		)
	Cash and cash equivalents - beginning of period	1.4			—			78.8			147.2			—			227.4
	Cash and cash equivalents - end of period	$	3.3		$	—		$	59.7		$	142.4		$	—		$	205.4
Condensed Balance Sheet [Table Text Block]	Condensed and Consolidated Balance Sheet
	March 31, 2015
	In millions	Parent			Issuer			Subsidiary Guarantors			Other			Consolidating			Allegion plc
											Subsidiaries			Adjustments
	Current assets:
	Cash and cash equivalents	$	5		$	8.8		$	65.7		$	150.1		$	—		$	229.6
	Accounts and notes receivable, net	—			—			126			129.8			—			255.8
	Inventories	—			—			106.6			78.3			—			184.9
	Other current assets	0.4			10.8			28.4			193.8			—			233.4
	Accounts and notes receivable affiliates	—			66.3			334.2			320.8			(721.3		)	—
	Total current assets	5.4			85.9			660.9			872.8			(721.3		)	903.7
	Investment in affiliates	912.3			2,295.60			90.5			4,255.90			(7,554.3		)	—
	Property, plant and equipment, net	—			—			148.8			57.5			—			206.3
	Intangible assets, net	—			—			161			449.3			—			610.3
	Notes receivable affiliates	—			1,191.90			3,727.50			1,750.60			(6,670.0		)	—
	Other noncurrent assets	15.1			10.6			69.8			111.6			—			207.1
	Total assets	$	932.8		$	3,584.00		$	4,858.50		$	7,497.70		$	(14,945.6	)	$	1,927.40
	Current liabilities:
	Accounts payable and accruals	$	1.9		$	9.1		$	195.2		$	226.5		$	—		$	432.7
	Short-term borrowings and current maturities of long-term debt	48.8			—			0.1			0.5			—			49.4
	Accounts and note payable affiliates	—			141			323.1			257.2			(721.3		)	—
	Total current liabilities	50.7			150.1			518.4			484.2			(721.3		)	482.1
	Long-term debt	901.9			300			0.1			0.7			—			1,202.70
	Note payable affiliate	—			2,762.50			—			3,907.50			(6,670.0		)	—
	Other noncurrent liabilities	—			7.3			210.5			23.3			—			241.1
	Total liabilities	952.6			3,219.90			729			4,415.70			(7,391.3		)	1,925.90
	Equity:
	Total shareholders equity (deficit)	(19.8		)	364.1			4,129.50			3,060.70			(7,554.3		)	(19.8		)
	Noncontrolling interests	—			—			—			21.3			—			21.3
	Total equity (deficit)	(19.8		)	364.1			4,129.50			3,082.00			(7,554.3		)	1.5
	Total liabilities and equity	$	932.8		$	3,584.00		$	4,858.50		$	7,497.70		$	(14,945.6	)	$	1,927.40
	Condensed and Consolidated Balance Sheet
	December 31, 2014
	In millions	Parent			Issuer			Subsidiary Guarantors			Other			Consolidating			Allegion plc
											Subsidiaries			Adjustments
	Current assets:
	Cash and cash equivalents	$	27.1		$	0.5		$	126.3		$	136.6		$	—		$	290.5
	Accounts and notes receivable, net	—			—			115.7			144.2			—			259.9
	Inventories	—			—			101.1			78.4			—			179.5
	Other current assets	0.4			46.6			15.6			181.3			—			243.9
	Accounts receivable affiliates	0.1			15.2			256.4			259.4			(531.1		)	—
	Total current assets	27.6			62.3			615.1			799.9			(531.1		)	973.8
	Investment in affiliates	917.4			2,336.70			90.6			4,774.70			(8,119.4		)	—
	Property, plant and equipment, net	—			—			147.3			63.9			—			211.2
	Intangible assets, net	—			—			161.1			470.6			—			631.7
	Notes receivable affiliates	—			1,191.90			3,731.20			1,762.90			(6,686.0		)	—
	Other noncurrent assets	16.3			10.6			62.3			110			—			199.2
	Total assets	$	961.3		$	3,601.50		$	4,807.60		$	7,982.00		$	(15,336.5	)	$	2,015.90
	Current liabilities:
	Accounts payable and accruals	$	2.8		$	51.3		$	380.8		$	46.8		$	—		$	481.7
	Short-term borrowings and current maturities of long-term debt	48.8			—			0.1			0.7			—			49.6
	Accounts and note payable affiliates	0.4			101.1			245			184.6			(531.1		)	—
	Total current liabilities	52			152.4			625.9			232.1			(531.1		)	531.3
	Long-term debt	914.1			300			0.1			0.8			—			1,215.00
	Note payable affiliate	—			2,778.40			—			3,907.60			(6,686.0		)	—
	Other noncurrent liabilities	—			5.8			206.2			39.1			—			251.1
	Total liabilities	966.1			3,236.60			832.2			4,179.60			(7,217.1		)	1,997.40
	Equity:
	Total shareholders equity (deficit)	(4.8		)	364.9			3,975.40			3,779.10			(8,119.4		)	(4.8		)
	Noncontrolling interests	—			—			—			23.3			—			23.3
	Total equity (deficit)	(4.8		)	364.9			3,975.40			3,802.40			(8,119.4		)	18.5
	Total liabilities and equity	$	961.3		$	3,601.50		$	4,807.60		$	7,982.00		$	(15,336.5	)	$	2,015.90
Condensed Statement Of Comprehensive Income [Table Text Block]	Condensed and Consolidated Statement of Comprehensive Income
	For the three months ended March 31, 2015
	In millions	Parent			Issuer			Subsidiary Guarantors			Other			Consolidating			Allegion plc
											Subsidiaries			Adjustments
	Net revenues	$	—		$	—		$	341.1		$	163.8		$	(46.2	)	$	458.7
	Cost of goods sold	—			—			198.3			119.5			(46.2		)	271.6
	Selling and administrative expenses	0.9			—			72.8			42.4			—			116.1
	Operating income (loss)	(0.9		)	—			70			1.9			—			71
	Equity earnings (loss) in affiliates, net of tax	52.7			10			0.5			48.2			(111.4		)	—
	Interest expense	6.5			5.1			—			—			—			11.6
	Intercompany interest and fees	—			(23.5		)	9.1			14.4			—			—
	Other (gain) loss, net	(0.1		)	(0.2		)	0.4			3			—			3.1
	Earnings (loss) before income taxes	45.4			(18.4		)	79.2			61.5			(111.4		)	56.3
	Provision (benefit) for income taxes	—			(10.9		)	30.3			(7.0		)	—			12.4
	Earnings (loss) from continuing operations	45.4			(7.5		)	48.9			68.5			(111.4		)	43.9
	Discontinued operations, net of tax	—			—			(0.2		)	—			—			(0.2		)
	Net earnings (loss)	45.4			(7.5		)	48.7			68.5			(111.4		)	43.7
	Less: Net loss attributable to noncontrolling interests	—			—			—			(1.7		)	—			(1.7		)
	Net earnings (loss) attributable to Allegion plc	$	45.4		$	(7.5	)	$	48.7		$	70.2		$	(111.4	)	$	45.4
	Total comprehensive income (loss)	$	15		$	(8.8	)	$	52.6		$	35.4		$	(80.9	)	$	13.3
	Less: Total comprehensive income attributable to noncontrolling interests	—			—			—			(1.7		)	—			(1.7		)
	Total comprehensive income (loss) attributable to Allegion plc	$	15		$	(8.8	)	$	52.6		$	37.1		$	(80.9	)	$	15
	Condensed and Consolidated Statement of Comprehensive Income
	For the three months ended March 31, 2014
	In millions	Parent			Issuer			Subsidiary Guarantors			Other			Consolidating			Allegion plc
											Subsidiaries			Adjustments
	Net revenues	$	—		$	—		$	312.6		$	196.4		$	(42.4	)	$	466.6
	Cost of goods sold	—			—			178.3			138.5			(42.4		)	274.4
	Selling and administrative expenses	1			—			69.7			53.7			—			124.4
	Operating income (loss)	(1.0		)	—			64.6			4.2			—			67.8
	Equity earnings (loss) in affiliates, net of tax	36.8			38			0.6			87.6			(163.0		)	—
	Interest expense	—			12.4			—			0.7			—			13.1
	Intercompany interest and fees	—			(12.4		)	75.3			(62.9		)	—			—
	Other (gain) loss, net	—			—			(0.1		)	—			—			(0.1		)
	Earnings (loss) before income taxes	35.8			13.2			140.6			28.2			(163.0		)	54.8
	Provision (benefit) for income taxes	—			(9.3		)	52.5			(26.8		)	—			16.4
	Earnings (loss) from continuing operations	35.8			22.5			88.1			55			(163.0		)	38.4
	Discontinued operations, net of tax	—			—			—			(0.8		)	—			(0.8		)
	Net earnings (loss)	35.8			22.5			88.1			54.2			(163.0		)	37.6
	Less: Net earnings attributable to noncontrolling interests	—			—			—			1.8			—			1.8
	Net earnings (loss) attributable to Allegion plc	$	35.8		$	22.5		$	88.1		$	52.4		$	(163.0	)	$	35.8
	Total comprehensive income (loss)	$	22.6		$	22.5		$	87.9		$	53.5		$	(162.9	)	$	23.6
	Less: Total comprehensive income attributable to noncontrolling interests	—			—			—			1			—			1
	Total comprehensive income (loss) attributable to Allegion plc	$	22.6		$	22.5		$	87.9		$	52.5		$	(162.9	)	$	22.6

Discontinued_Operations_Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	Net revenues and after-tax earnings of the component for the three months ended March 31 were as follows:
	In millions	2015			2014
	Net revenues	$	—		$	5.8
	After-tax loss from operations	$	(0.1	)	$	(0.6	)
	Discontinued operations, net of tax	$	(0.1	)	$	(0.6	)

Inventories_Schedule_of_Major_

Inventories (Schedule of Major Classes of Inventory) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Inventory, Net [Abstract]
Raw materials	$59.70	$54.80
Work-in-process	34.7	32.1
Finished goods	90.5	92.6
Total	$184.90	$179.50

Goodwill_Details

Goodwill (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
December 31, 2014 (gross)	$991.50
Currency translation	-7.4
Accumulated impairment		-485.5
March 31, 2015 Goodwill (net)	498.6	506
Americas [Member]
Goodwill [Roll Forward]
December 31, 2014 (gross)	364.8
Currency translation	-0.1
Accumulated impairment		0
March 31, 2015 Goodwill (net)	364.7	364.8
EMEIA [Member]
Goodwill [Roll Forward]
December 31, 2014 (gross)	533.1
Currency translation	-5.6
Accumulated impairment		-478.6
March 31, 2015 Goodwill (net)	48.9	54.5
Asia Pacific [Member]
Goodwill [Roll Forward]
December 31, 2014 (gross)	93.6
Currency translation	-1.7
Accumulated impairment		-6.9
March 31, 2015 Goodwill (net)	$85	$86.70

Intangible_Assets_Details

Intangible Assets (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule of Acquired Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	$200.40		$222.60
Accumulated amortization	-98.8		-107
Net finite-lived intangible assets	101.6		115.6
Total intangible assets, gross	210.5		232.7
Intangible assets, net	111.7		125.7
Amortization of intangible assets	1.8	2.5
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2014	6.9
2015	6.9
2016	6.9
2017	6.8
2018	6.8
Trademarks [Member]
Schedule of Acquired Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Line Items]
Trademarks (indefinite-lived)	10.1		10.1
Completed technologies/patents [Member]
Schedule of Acquired Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	26.3		27.8
Accumulated amortization	-22.1		-23.2
Net finite-lived intangible assets	4.2		4.6
Customer relationships [Member]
Schedule of Acquired Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	84.4		94.7
Accumulated amortization	-33.8		-37
Net finite-lived intangible assets	50.6		57.7
Trademarks [Member]
Schedule of Acquired Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	79.7		89.3
Accumulated amortization	-32.9		-36
Net finite-lived intangible assets	46.8		53.3
Other Intangible Assets [Member]
Schedule of Acquired Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	10		10.8
Accumulated amortization	-10		-10.8
Net finite-lived intangible assets	$0		$0

Debt_and_Credit_Facilities_Sum

Debt and Credit Facilities (Summary of Debt) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Debt Instrument [Line Items]
Other debt, including capital leases, maturing in various amounts through 2016	$1.50	$1.80
Total debt	1,252.10	1,264.60
Less: current portion of long term debt	49.4	49.6
Long-term debt	1,202.70	1,215
Secured Debt [Member] | Term Loan A Facility Due 2019 [Member]
Debt Instrument [Line Items]
Term Loan Facility due 2019	975
Secured Debt [Member] | Subsidiaries [Member] | Term Loan A Facility Due 2019 [Member]
Debt Instrument [Line Items]
Term Loan Facility due 2019	950.6	962.8
Senior Notes [Member] | Subsidiaries [Member] | 5.75% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Term Loan Facility due 2019	$300	$300
5.75% Senior notes due 2021	5.75%

Debt_and_Credit_Facilities_Nar

Debt and Credit Facilities (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Secured Debt [Member] | Term Loan A Facility Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	$975,000,000
Subsidiaries [Member]
Debt Instrument [Line Items]
Letters of credit outstanding amount	28,600,000
Subsidiaries [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity	500,000,000
Subsidiaries [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.30%
Principal amount of notes	975,000,000
Debt repayments	12,200,000
Subsidiaries [Member] | Secured Debt [Member] | Term Loan A Facility Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	950,600,000	962,800,000
Subsidiaries [Member] | Secured Debt [Member] | Term Loan A Facility Due 2019 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable interest rate	1.75%
Stated interest rate percentage, minimum	1.50%
Stated interest rate percentage, maximum	2.00%
Subsidiaries [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.75%
Subsidiaries [Member] | Senior Notes [Member] | 5.75% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Principal amount of notes	300,000,000
Long-term debt	300,000,000	300,000,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Principal amount of notes	300,000,000
Interest Rate Swap Expiration September 2017 [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount	275,000,000
Interest Rate Swap Expiration December 2016 [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount	$25,000,000

Financial_Instruments_Narrativ

Financial Instruments (Narrative) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2013	Dec. 31, 2012
Deferred gain/loss, net of tax, included in accumulated other comprehensive income (AOCI) related to the fair value of the Company's currency derivatives designated as accounting hedges	($178,700,000)	($148,200,000)	($109,900,000)	($96,700,000)
Currency derivatives expected to be reclassified into earnings over the next twelve months	2,800,000
Designated as Hedging Instrument [Member]
Derivative, Notional Amount	523,100,000	494,500,000
Deferred gain/loss, net of tax, included in accumulated other comprehensive income (AOCI) related to the fair value of the Company's currency derivatives designated as accounting hedges	2,800,000	1,600,000
Interest Rate Swap [Member]
Deferred gain/loss, net of tax, included in accumulated other comprehensive income (AOCI) related to the fair value of the Company's currency derivatives designated as accounting hedges	2,300,000
Interest Rate Swap Expiration September 2017 [Member]
Derivative, Notional Amount	275,000,000
Interest Rate Swap Expiration December 2016 [Member]
Derivative, Notional Amount	25,000,000
Interest Rate Swap [Member]
Principal amount of notes	300,000,000
Term Loan A Facility Due 2019 [Member] | Secured Debt [Member]
Long-term debt	$975,000,000

Financial_Instruments_Schedule

Financial Instruments (Schedule of the Fair Values of Derivative Instruments) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]
Derivative asset fair value	$12.80	$4.30
Derivative liability fair value	34.7	14.8
Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivatives designated as hedges, asset at fair value	3.4	2.1
Derivatives designated as hedges, liability at fair value	0	0
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	2.3	0.9
Interest Rate Derivative Assets, at Fair Value	0	0
Nondesignated [Member]
Derivatives, Fair Value [Line Items]
Derivatives not designated as hedges, asset at fair value	9.4	2.2
Derivatives not designated as hedges, liability at fair value	32.4	13.9
Recurring fair value measurements [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	2.3	0.9
Derivative asset fair value	12.8	4.3
Derivative liability fair value	32.4	13.9
Significant Other Observable Inputs (Level 2) [Member] | Recurring fair value measurements [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	2.3	0.9
Derivative asset fair value	12.8	4.3
Derivative liability fair value	$32.40	$13.90

Financial_Instruments_Schedule1

Financial Instruments (Schedule of Derivatives Designated as Hedges Affecting Condensed Consolidated Income Statement and Accumulated Other Comprehensive Income) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income	$1.90	$0.70
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income	1.7	-0.4
Currency Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income	3.3	0.7
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income	-1.4	0
Cost of Goods Sold [Member] | Currency Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income	1.7	-0.4
Interest Expense [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income	$0	$0

Pensions_and_Postretirement_Be2

Pensions and Postretirement Benefits Other than Pensions (Narrative) (Details) (Pension Plans [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Pension Plans [Member]
Company contributions	$0.10	$0.50
Additional contributions expected during the remainder of the year	$5

Pensions_and_Postretirement_Be3

Pensions and Postretirement Benefits Other than Pensions (Components of the Company's Pension-Related Costs) (Details) (Pension Cost [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net curtailment and settlement losses	($0.60)	$0
Net periodic pension benefit cost after curtailment	4.2	2.5
UNITED STATES
Service cost	2.4	1.8
Interest cost	2.7	2.8
Expected return on plan assets	-2.8	-2.8
Net amortization of prior service costs	0.2	0.2
Net amortization of plan net actuarial losses	1.1	0.5
Net periodic pension benefit cost	3.6	2.5
Non-U.S. [Member]
Service cost	0.8	1.2
Interest cost	3.4	4.3
Expected return on plan assets	-4.4	-4.3
Net amortization of plan net actuarial losses	0.4	0.7
Net periodic pension benefit cost	$0.20	$1.90

Pensions_and_Postretirement_Be4

Pensions and Postretirement Benefits Other than Pensions (Components of Net Periodic Postretirement Benefit Cost) (Details) (Postretirement Benefit Costs [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Postretirement Benefit Costs [Member]
Service cost	$0	$0.10
Interest cost	0.1	0.1
Net amortization of prior service gains	-0.4	-0.4
Total	($0.30)	($0.20)

Fair_Value_Measurement_Details

Fair Value Measurement (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Assets, fair value measurements [Abstract]
Derivative instruments	$12.80	$4.30
Liabilities, fair value measurements [Abstract]
Derivative instruments	34.7	14.8
Recurring fair value measurements [Member]
Assets, fair value measurements [Abstract]
Marketable Securities	23	17.9
Derivative instruments	12.8	4.3
Total assets, fair value measurements	35.8	22.2
Liabilities, fair value measurements [Abstract]
Derivative instruments	32.4	13.9
Interest Rate Derivative Liabilities, at Fair Value	2.3	0.9
Total liability, fair value measurements	34.7	14.8
Recurring fair value measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, fair value measurements [Abstract]
Marketable Securities	23	17.9
Derivative instruments	0	0
Total assets, fair value measurements	23	17.9
Liabilities, fair value measurements [Abstract]
Derivative instruments	0	0
Interest Rate Derivative Liabilities, at Fair Value	0	0
Total liability, fair value measurements	0	0
Recurring fair value measurements [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, fair value measurements [Abstract]
Marketable Securities	0	0
Derivative instruments	12.8	4.3
Total assets, fair value measurements	12.8	4.3
Liabilities, fair value measurements [Abstract]
Derivative instruments	32.4	13.9
Interest Rate Derivative Liabilities, at Fair Value	2.3	0.9
Total liability, fair value measurements	34.7	14.8
Recurring fair value measurements [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, fair value measurements [Abstract]
Marketable Securities	0	0
Derivative instruments	0	0
Total assets, fair value measurements	0	0
Liabilities, fair value measurements [Abstract]
Derivative instruments	0	0
Interest Rate Derivative Liabilities, at Fair Value	0	0
Total liability, fair value measurements	0	0
Financial Instruments not carried at fair value [Member]
Liabilities, fair value measurements [Abstract]
Total debt	1,265.40	1,279.40
Total financial instruments not carried at fair value	1,265.40	1,279.40
Financial Instruments not carried at fair value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Liabilities, fair value measurements [Abstract]
Total debt	0	0
Total financial instruments not carried at fair value	0	0
Financial Instruments not carried at fair value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Liabilities, fair value measurements [Abstract]
Total debt	1,265.40	1,279.40
Total financial instruments not carried at fair value	1,265.40	1,279.40
Financial Instruments not carried at fair value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Liabilities, fair value measurements [Abstract]
Total debt	0	0
Total financial instruments not carried at fair value	$0	$0

Equity_Reconciliation_of_Ordin

Equity (Reconciliation of Ordinary Shares) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Increase (Decrease) In Ordinary Shares [Roll Forward]
Treasury Stock, Shares, Acquired	0.5
Treasury Stock, Value, Acquired, Cost Method	($30)
Common Stock [Member]
Increase (Decrease) In Ordinary Shares [Roll Forward]
31-Dec-14	95.8
Shares issued under incentive plans, net	0.3
Treasury Stock, Shares, Acquired	-0.5
31-Mar-15	95.6

Equity_Components_of_Sharehold

Equity (Components of Shareholders' Equity) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2013	Dec. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31:	$18.50		($7.40)	($35)
Net earnings (loss)	43.7	37.6
Currency translation	-38.9	-12.9
Change in value of marketable securities and derivatives qualifying as cash flow hedges, net of tax	4.6	-0.4
Pension and OPEB adjustments, net of tax	3.9	-0.7
Total comprehensive income	13.3	23.6
Share-based compensation	3.6	3.4
Dividends to noncontrolling interests	-0.3
Dividends to ordinary shareholders	-9.6	-7.7
Treasury Stock, Value, Acquired, Cost Method	-30
Shares issued under incentive plans, net	6	11.8
Other		-3.5
Balance at March 31:	1.5		-7.4	-35
Treasury Stock, Shares, Acquired	0.5
Shareholders' Equity [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31:	-4.8		-39.5	-66.1
Net earnings (loss)	45.4	35.8
Currency translation	-38.9	-12.1
Change in value of marketable securities and derivatives qualifying as cash flow hedges, net of tax	4.6	-0.4
Pension and OPEB adjustments, net of tax	3.9	-0.7
Total comprehensive income	15	22.6
Share-based compensation	3.6	3.4
Dividends to noncontrolling interests	0
Dividends to ordinary shareholders	-9.6	-7.7
Treasury Stock, Value, Acquired, Cost Method	-30
Shares issued under incentive plans, net	6	11.8
Other		-3.5
Balance at March 31:	-19.8		-39.5	-66.1
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31:	23.3		32.1	31.1
Net earnings (loss)	-1.7	1.8
Currency translation	0	-0.8
Change in value of marketable securities and derivatives qualifying as cash flow hedges, net of tax	0	0
Pension and OPEB adjustments, net of tax	0	0
Total comprehensive income	-1.7	1
Share-based compensation	0	0
Dividends to noncontrolling interests	-0.3
Dividends to ordinary shareholders	0	0
Treasury Stock, Value, Acquired, Cost Method	0
Shares issued under incentive plans, net	0	0
Other		0
Balance at March 31:	$21.30		$32.10	$31.10

Equity_Changes_in_Accumulated_

Equity (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2013	Dec. 31, 2012
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance at December 31:	($148.20)		($109.90)	($96.70)
Other comprehensive income before reclassifications	-29.6	-12
Amounts reclassified from accumulated other comprehensive income	-0.4	-1.1
Tax (expense) benefit	-0.5	-0.1
Balance at March 31:	-178.7		-109.9	-96.7
Cash flow hedges and marketable securities [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance at December 31:	15.7		16.3	16.7
Other comprehensive income before reclassifications	6.6	0.1
Amounts reclassified from accumulated other comprehensive income	-1.7	-0.4
Tax (expense) benefit	-0.4	-0.1
Balance at March 31:	20.2		16.3	16.7
Pension and OPEB Adjustments [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance at December 31:	-116.1		-132	-131.3
Other comprehensive income before reclassifications	2.7	0
Amounts reclassified from accumulated other comprehensive income	1.3	-0.7
Tax (expense) benefit	-0.1	0
Balance at March 31:	-112.2		-132	-131.3
Foreign Currency Gain (Loss) [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance at December 31:	-47.8		5.8	17.9
Other comprehensive income before reclassifications	-38.9	-12.1
Amounts reclassified from accumulated other comprehensive income	0	0
Tax (expense) benefit	0	0
Balance at March 31:	($86.70)		$5.80	$17.90

Equity_Reclassification_Adjust

Equity (Reclassification Adjustments out of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Prior-service gains	($0.20)	($0.70)
Amortization of actuarial (gains) losses	1.5
Earnings before income taxes [Member]
Gains and losses on cash flow hedges	-1.7	-0.4
Earnings from continuing operations [Member]
Cash flow hedge reclassification adjustments, net of tax	-1.7	-0.4
Defined benefit plan reclassification adjustments, net of tax	1.3	-0.7
Total reclassifications from Other comprehensive income (loss), net of tax	-0.4	-1.1
Provision for income taxes [Member]
Tax effect on cash flow hedge reclassification adjustments	0	0
Cost of Goods Sold [Member] | Currency Derivatives [Member]
Gains and losses on cash flow hedges	($1.70)	($0.40)

ShareBased_Compensation_Narrat

Share-Based Compensation (Narrative) (Details)	3 Months Ended	1 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Stock options and Restricted Stock Units (RSUs) [Member]
Vesting period, in years	3 years
Performance Shares [Member]
Maximum award level for eligible employees (in shares)	0.1
Percentage of awards applied to performance condition		50.00%
Percentage of awards applied to market condition		50.00%

ShareBased_Compensation_ShareB

Share-Based Compensation (Share-Based Compensation Expense) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Share based compensation expense	$4	$3.50
Tax benefit	-1.3	-1.3
After-tax expense	2.7	2.2
Stock Options [Member]
Share based compensation expense	1	1.1
Restricted Stock Units (RSUs) [Member]
Share based compensation expense	1.6	1.9
Performance Shares [Member]
Share based compensation expense	1	0.3
Deferred Compensation [Member]
Share based compensation expense	$0.40	$0.20

ShareBased_Compensation_Grants

Share-Based Compensation (Grants of Stock Options and RSUs) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock Options [Member]
Equity awards, granted, in shares	220,679	185,297
Weighted average fair value per award, in dollars per share	$17.88	$19.56
RSUs [Member]
Equity awards, granted, in shares	80,913	77,499
Weighted average fair value per award, in dollars per share	$57.85	$54.13

ShareBased_Compensation_Averag

Share-Based Compensation (Average Fair Value of Stock Options Granted, Assumptions) (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation [Abstract]
Dividend yield	0.69%	0.60%
Volatility	34.02%	36.55%
Risk-free rate of return	1.78%	1.94%
Expected life, in years	6 years 0 months 0 days	6 years 0 months 0 days

Restructuring_Activities_Narra

Restructuring Activities (Narrative) (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, current	$1.90

Restructuring_Activities_Sched

Restructuring Activities (Schedule of Changes in Restructuring Reserve) (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Restructuring Reserve [Roll Forward]
31-Dec-14	$1.90
31-Mar-15	$1.90

Other_Net_Details

Other, Net (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Other Net [Abstract]
Interest income	($0.30)	($0.20)
Exchange gain (loss)	3.3	0.1
Other	0.1	0
Other, net	3.1	-0.1
Foreign currency translation loss related to the devaluation of the Venezuelan Bolivar		$2.80

Income_Taxes_Details

Income Taxes (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate (percent)	22.00%	29.90%

Earnings_Per_Share_EPS_Details

Earnings Per Share (EPS) (Details)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Weighted-average number of basic shares	95.9	96.3
Shares issuable under incentive stock plans	1	1.1
Weighted average number of diluted shares	96.9	97.4

Business_Segment_Information_N

Business Segment Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2015
	segment
Segment Reporting [Abstract]
Number of reportable segments	3

Business_Segment_Information_S

Business Segment Information (Summary of Operations by Reportable Segments) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net revenues	$458.70	$466.60
Segment operating income	84.2	82.8
Operating income (loss)	71	67.8
Interest expense	11.6	13.1
Other (gain) loss, net	-3.1	0.1
Earnings before income taxes	56.3	54.8
Americas [Member]
Net revenues	354.3	345.4
Segment operating income	84.2	86.4
EMEIA [Member]
Net revenues	81.7	99.2
Segment operating income	2.6	-0.6
Asia Pacific [Member]
Net revenues	22.7	22
Segment operating income	-2.6	-3
Unallocated Amount to Segment [Member]
Unallocated corporate expense	($13.20)	($15)

Commitments_and_Contingencies_1

Commitments and Contingencies (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Expense for environmental remediation	$1.80	$0.80
Reserves for environmental matters	9.4		8.8
Reserves for environmental matters, current	2.7		2.2
Segment, Discontinued Operations [Member]
Reserves for environmental matters	$2.80		$2.40

Commitments_and_Contingencies_2

Commitments and Contingencies (Product Warranty Liability) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2013	Dec. 31, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$10.30		$9.30	$9.80
Reductions for payments	-1.3	-1.6
Accruals for warranties issued during the current period	1.2	1.8
Changes to accruals related to preexisting warranties	0	-0.7
Translation	-0.2	0
Balance at end of period	$10		$9.30	$9.80

Guarantor_Financial_Informatio2

Guarantor Financial Information (Statement of Comprehensive Income) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net revenues	$458.70	$466.60
Cost of goods sold	271.6	274.4
Selling and administrative expenses	116.1	124.4
Operating income	71	67.8
Equity earnings (loss) in affiliates, net of tax	0	0
Interest expense	11.6	13.1
Intercompany interest and fees	0	0
Other (gain) loss, net	3.1	-0.1
Earnings before income taxes	56.3	54.8
Provision (benefit) for income taxes	12.4	16.4
Earnings from continuing operations	43.9	38.4
Discontinued operations, net of tax	-0.2	-0.8
Net earnings (loss)	43.7	37.6
Less: Net loss attributable to noncontrolling interests	1.7	-1.8
Net earnings attributable to Allegion plc	45.4	35.8
Total comprehensive income	13.3	23.6
Less: Total comprehensive income (loss) attributable to noncontrolling interests	-1.7	1
Total comprehensive income attributable to Allegion plc	15	22.6
Other Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	163.8	196.4
Cost of goods sold	119.5	138.5
Selling and administrative expenses	42.4	53.7
Operating income	1.9	4.2
Equity earnings (loss) in affiliates, net of tax	48.2	87.6
Interest expense	0	0.7
Intercompany interest and fees	14.4	-62.9
Other (gain) loss, net	3	0
Earnings before income taxes	61.5	28.2
Provision (benefit) for income taxes	-7	-26.8
Earnings from continuing operations	68.5	55
Discontinued operations, net of tax	0	-0.8
Net earnings (loss)	68.5	54.2
Less: Net loss attributable to noncontrolling interests	1.7	-1.8
Net earnings attributable to Allegion plc	70.2	52.4
Total comprehensive income	35.4	53.5
Less: Total comprehensive income (loss) attributable to noncontrolling interests	-1.7	1
Total comprehensive income attributable to Allegion plc	37.1	52.5
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	-46.2	-42.4
Cost of goods sold	-46.2	-42.4
Selling and administrative expenses	0	0
Operating income	0	0
Equity earnings (loss) in affiliates, net of tax	-111.4	-163
Interest expense	0	0
Intercompany interest and fees	0	0
Other (gain) loss, net	0	0
Earnings before income taxes	-111.4	-163
Provision (benefit) for income taxes	0	0
Earnings from continuing operations	-111.4	-163
Discontinued operations, net of tax	0	0
Net earnings (loss)	-111.4	-163
Less: Net loss attributable to noncontrolling interests	0	0
Net earnings attributable to Allegion plc	-111.4	-163
Total comprehensive income	-80.9	-162.9
Less: Total comprehensive income (loss) attributable to noncontrolling interests	0	0
Total comprehensive income attributable to Allegion plc	-80.9	-162.9
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	0	0
Cost of goods sold	0	0
Selling and administrative expenses	0.9	1
Operating income	-0.9	-1
Equity earnings (loss) in affiliates, net of tax	52.7	36.8
Interest expense	6.5	0
Intercompany interest and fees	0	0
Other (gain) loss, net	-0.1	0
Earnings before income taxes	45.4	35.8
Provision (benefit) for income taxes	0	0
Earnings from continuing operations	45.4	35.8
Discontinued operations, net of tax	0	0
Net earnings (loss)	45.4	35.8
Less: Net loss attributable to noncontrolling interests	0	0
Net earnings attributable to Allegion plc	45.4	35.8
Total comprehensive income	15	22.6
Less: Total comprehensive income (loss) attributable to noncontrolling interests	0	0
Total comprehensive income attributable to Allegion plc	15	22.6
Subsidiary Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	0	0
Cost of goods sold	0	0
Selling and administrative expenses	0	0
Operating income	0	0
Equity earnings (loss) in affiliates, net of tax	10	38
Interest expense	5.1	12.4
Intercompany interest and fees	-23.5	-12.4
Other (gain) loss, net	-0.2	0
Earnings before income taxes	-18.4	13.2
Provision (benefit) for income taxes	-10.9	-9.3
Earnings from continuing operations	-7.5	22.5
Discontinued operations, net of tax	0	0
Net earnings (loss)	-7.5	22.5
Less: Net loss attributable to noncontrolling interests	0	0
Net earnings attributable to Allegion plc	-7.5	22.5
Total comprehensive income	-8.8	22.5
Less: Total comprehensive income (loss) attributable to noncontrolling interests	0	0
Total comprehensive income attributable to Allegion plc	-8.8	22.5
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	341.1	312.6
Cost of goods sold	198.3	178.3
Selling and administrative expenses	72.8	69.7
Operating income	70	64.6
Equity earnings (loss) in affiliates, net of tax	0.5	0.6
Interest expense	0	0
Intercompany interest and fees	9.1	75.3
Other (gain) loss, net	0.4	-0.1
Earnings before income taxes	79.2	140.6
Provision (benefit) for income taxes	30.3	52.5
Earnings from continuing operations	48.9	88.1
Discontinued operations, net of tax	-0.2	0
Net earnings (loss)	48.7	88.1
Less: Net loss attributable to noncontrolling interests	0	0
Net earnings attributable to Allegion plc	48.7	88.1
Total comprehensive income	52.6	87.9
Less: Total comprehensive income (loss) attributable to noncontrolling interests	0	0
Total comprehensive income attributable to Allegion plc	$52.60	$87.90

Guarantor_Financial_Informatio3

Guarantor Financial Information (Balance Sheet) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$229.60	$290.50	$205.40	$227.40
Accounts and notes receivable, net	255.8	259.9
Inventories	184.9	179.5
Other current assets	233.4	243.9
Accounts and notes receivable affiliates	0	0
Total current assets	903.7	973.8
Investment in affiliates	0	0
Property, plant and equipment, net	206.3	211.2
Intangible assets, net	610.3	631.7
Notes receivable affiliates	0	0
Other noncurrent assets	207.1	199.2
Total assets	1,927.40	2,015.90
Current liabilities:
Accounts payable and accruals	432.7	481.7
Short-term borrowings and current maturities of long-term debt	49.4	49.6
Accounts and note payable affiliates	0	0
Total current liabilities	482.1	531.3
Long-term debt	1,202.70	1,215
Note payable affiliate	0	0
Other noncurrent liabilities	241.1	251.1
Total liabilities	1,925.90	1,997.40
Equity:
Stockholders' Equity Attributable to Parent	-19.8	-4.8
Noncontrolling interests	21.3	23.3
Total equity (deficit)	1.5	18.5	-7.4	-35
Total liabilities and equity	1,927.40	2,015.90
Parent Company [Member]
Current assets:
Cash and cash equivalents	5	27.1	3.3	1.4
Accounts and notes receivable, net	0	0
Inventories	0	0
Other current assets	0.4	0.4
Accounts and notes receivable affiliates	0	0.1
Total current assets	5.4	27.6
Investment in affiliates	912.3	917.4
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Notes receivable affiliates	0	0
Other noncurrent assets	15.1	16.3
Total assets	932.8	961.3
Current liabilities:
Accounts payable and accruals	1.9	2.8
Short-term borrowings and current maturities of long-term debt	48.8	48.8
Accounts and note payable affiliates	0	0.4
Total current liabilities	50.7	52
Long-term debt	901.9	914.1
Note payable affiliate	0	0
Other noncurrent liabilities	0	0
Total liabilities	952.6	966.1
Equity:
Stockholders' Equity Attributable to Parent	-19.8	-4.8
Noncontrolling interests	0	0
Total equity (deficit)	-19.8	-4.8
Total liabilities and equity	932.8	961.3
Subsidiary Issuer [Member]
Current assets:
Cash and cash equivalents	8.8	0.5	0	0
Accounts and notes receivable, net	0	0
Inventories	0	0
Other current assets	10.8	46.6
Accounts and notes receivable affiliates	66.3	15.2
Total current assets	85.9	62.3
Investment in affiliates	2,295.60	2,336.70
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Notes receivable affiliates	1,191.90	1,191.90
Other noncurrent assets	10.6	10.6
Total assets	3,584	3,601.50
Current liabilities:
Accounts payable and accruals	9.1	51.3
Short-term borrowings and current maturities of long-term debt	0	0
Accounts and note payable affiliates	141	101.1
Total current liabilities	150.1	152.4
Long-term debt	300	300
Note payable affiliate	2,762.50	2,778.40
Other noncurrent liabilities	7.3	5.8
Total liabilities	3,219.90	3,236.60
Equity:
Stockholders' Equity Attributable to Parent	364.1	364.9
Noncontrolling interests	0	0
Total equity (deficit)	364.1	364.9
Total liabilities and equity	3,584	3,601.50
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	65.7	126.3	59.7	78.8
Accounts and notes receivable, net	126	115.7
Inventories	106.6	101.1
Other current assets	28.4	15.6
Accounts and notes receivable affiliates	334.2	256.4
Total current assets	660.9	615.1
Investment in affiliates	90.5	90.6
Property, plant and equipment, net	148.8	147.3
Intangible assets, net	161	161.1
Notes receivable affiliates	3,727.50	3,731.20
Other noncurrent assets	69.8	62.3
Total assets	4,858.50	4,807.60
Current liabilities:
Accounts payable and accruals	195.2	380.8
Short-term borrowings and current maturities of long-term debt	0.1	0.1
Accounts and note payable affiliates	323.1	245
Total current liabilities	518.4	625.9
Long-term debt	0.1	0.1
Note payable affiliate	0	0
Other noncurrent liabilities	210.5	206.2
Total liabilities	729	832.2
Equity:
Stockholders' Equity Attributable to Parent	4,129.50	3,975.40
Noncontrolling interests	0	0
Total equity (deficit)	4,129.50	3,975.40
Total liabilities and equity	4,858.50	4,807.60
Other Subsidiaries [Member]
Current assets:
Cash and cash equivalents	150.1	136.6	142.4	147.2
Accounts and notes receivable, net	129.8	144.2
Inventories	78.3	78.4
Other current assets	193.8	181.3
Accounts and notes receivable affiliates	320.8	259.4
Total current assets	872.8	799.9
Investment in affiliates	4,255.90	4,774.70
Property, plant and equipment, net	57.5	63.9
Intangible assets, net	449.3	470.6
Notes receivable affiliates	1,750.60	1,762.90
Other noncurrent assets	111.6	110
Total assets	7,497.70	7,982
Current liabilities:
Accounts payable and accruals	226.5	46.8
Short-term borrowings and current maturities of long-term debt	0.5	0.7
Accounts and note payable affiliates	257.2	184.6
Total current liabilities	484.2	232.1
Long-term debt	0.7	0.8
Note payable affiliate	3,907.50	3,907.60
Other noncurrent liabilities	23.3	39.1
Total liabilities	4,415.70	4,179.60
Equity:
Stockholders' Equity Attributable to Parent	3,060.70	3,779.10
Noncontrolling interests	21.3	23.3
Total equity (deficit)	3,082	3,802.40
Total liabilities and equity	7,497.70	7,982
Consolidation, Eliminations [Member]
Current assets:
Cash and cash equivalents	0	0	0	0
Accounts and notes receivable, net	0	0
Inventories	0	0
Other current assets	0	0
Accounts and notes receivable affiliates	-721.3	-531.1
Total current assets	-721.3	-531.1
Investment in affiliates	-7,554.30	-8,119.40
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Notes receivable affiliates	-6,670	-6,686
Other noncurrent assets	0	0
Total assets	-14,945.60	-15,336.50
Current liabilities:
Accounts payable and accruals	0	0
Short-term borrowings and current maturities of long-term debt	0	0
Accounts and note payable affiliates	-721.3	-531.1
Total current liabilities	-721.3	-531.1
Long-term debt	0	0
Note payable affiliate	-6,670	-6,686
Other noncurrent liabilities	0	0
Total liabilities	-7,391.30	-7,217.10
Equity:
Stockholders' Equity Attributable to Parent	-7,554.30	-8,119.40
Noncontrolling interests	0	0
Total equity (deficit)	-7,554.30	-8,119.40
Total liabilities and equity	($14,945.60)	($15,336.50)

Guarantor_Financial_Informatio4

Guarantor Financial Information (Statement of Cash Flow) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	$4.60	$0
Net cash provided by (used in) discontinued operating activities	-0.2	-0.9
Net cash provided by (used in) operating activities	4.4	-0.9
Cash flows from investing activities:
Capital expenditures	-9.4	-9.2
Acquisition of businesses, net of cash acquired	-9	-5.3
Proceeds from sale of property, plant and equipment		0.2
Other investing activities, net	4	0.2
Net cash used in investing activities	-14.4	-14.3
Cash flows from financing activities:
Debt repayments	-12.4	-8
Net inter-company proceeds (payments)	0	0
Dividends (paid) received	0	7.2
Dividends paid to ordinary shareholders	9.5	7.2
Repurchase of ordinary shares	-30	0
Other financing activities, net	5.2	11.8
Net cash used in continuing financing activities	-46.7	-3.4
Effect of exchange rate changes on cash and cash equivalents	-4.2	-3.4
Net decrease in cash and cash equivalents	-60.9	-22
Cash and cash equivalents - beginning of period	290.5
Cash and cash equivalents - end of period	229.6
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	24.4	-3.2
Net cash provided by (used in) discontinued operating activities	0	0
Net cash provided by (used in) operating activities	24.4	-3.2
Cash flows from investing activities:
Capital expenditures	0	0
Acquisition of businesses, net of cash acquired	0	0
Proceeds from sale of property, plant and equipment		0
Other investing activities, net	0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Debt repayments	-12.2	0
Net inter-company proceeds (payments)	0	0.5
Dividends (paid) received	0	7.2
Repurchase of ordinary shares	-30
Other financing activities, net	5.2	11.8
Net cash used in continuing financing activities	-46.5	5.1
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	-22.1	1.9
Cash and cash equivalents - beginning of period	27.1
Cash and cash equivalents - end of period	5
Subsidiary Issuer [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	20.5	7.5
Net cash provided by (used in) discontinued operating activities	0	0
Net cash provided by (used in) operating activities	20.5	7.5
Cash flows from investing activities:
Capital expenditures	0	0
Acquisition of businesses, net of cash acquired	0	0
Proceeds from sale of property, plant and equipment		0
Other investing activities, net	0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Debt repayments	0	-7.5
Net inter-company proceeds (payments)	-12.2	0
Dividends (paid) received	0	0
Repurchase of ordinary shares	0
Other financing activities, net	0	0
Net cash used in continuing financing activities	-12.2	-7.5
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	8.3	0
Cash and cash equivalents - beginning of period	0.5
Cash and cash equivalents - end of period	8.8
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	-44.7	17.4
Net cash provided by (used in) discontinued operating activities	0	0
Net cash provided by (used in) operating activities	-44.7	17.4
Cash flows from investing activities:
Capital expenditures	-7.8	-6.8
Acquisition of businesses, net of cash acquired	-9	0
Proceeds from sale of property, plant and equipment		0.2
Other investing activities, net	4
Net cash used in investing activities	-12.8	-6.6
Cash flows from financing activities:
Debt repayments	0	0
Net inter-company proceeds (payments)	0	-29.9
Dividends (paid) received	3.1	0
Repurchase of ordinary shares	0
Other financing activities, net	0	0
Net cash used in continuing financing activities	-3.1	-29.9
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	-60.6	-19.1
Cash and cash equivalents - beginning of period	126.3
Cash and cash equivalents - end of period	65.7
Other Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	65.2	-21.7
Net cash provided by (used in) discontinued operating activities	-0.2	-0.9
Net cash provided by (used in) operating activities	65	-22.6
Cash flows from investing activities:
Capital expenditures	-1.6	-2.4
Acquisition of businesses, net of cash acquired	0	-5.3
Proceeds from sale of property, plant and equipment		0
Other investing activities, net	0
Net cash used in investing activities	-1.6	-7.7
Cash flows from financing activities:
Debt repayments	-0.2	-0.5
Net inter-company proceeds (payments)	12.2	29.4
Dividends (paid) received	57.7	0
Repurchase of ordinary shares	0
Other financing activities, net	0	0
Net cash used in continuing financing activities	-45.7	28.9
Effect of exchange rate changes on cash and cash equivalents	-4.2	-3.4
Net decrease in cash and cash equivalents	13.5	-4.8
Cash and cash equivalents - beginning of period	136.6
Cash and cash equivalents - end of period	150.1
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	-60.8	0
Net cash provided by (used in) discontinued operating activities	0	0
Net cash provided by (used in) operating activities	-60.8	0
Cash flows from investing activities:
Capital expenditures	0	0
Acquisition of businesses, net of cash acquired	0	0
Proceeds from sale of property, plant and equipment		0
Other investing activities, net	0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Debt repayments	0	0
Net inter-company proceeds (payments)	0	0
Dividends (paid) received	-60.8	0
Repurchase of ordinary shares	0
Other financing activities, net	0	0
Net cash used in continuing financing activities	60.8	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0
Cash and cash equivalents - end of period	$0

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Subsequent Event [Line Items]
Dividends declared per ordinary share (in dollars per share)	$0.10	$0.08

Discontinued_Operations_Detail

Discontinued Operations (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, net of tax	($0.20)	($0.80)
EMEIA Divestiture UK Door [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	0	5.8
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	-0.1	-0.6
Discontinued operations, net of tax	-0.1	-0.6
Other Divestitures [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, net of tax	($0.10)	($0.20)