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Divestitures and Discontinued Operations (Net Revenues and After-Tax Earnings) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Discontinued operations, net of tax $ (11.1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (3.6)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (4.2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
EMEIA Divestiture UK Door [Member]      
Net revenues 16.1us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= alle_EMEIADivestitureUKDoorMember
23.9us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= alle_EMEIADivestitureUKDoorMember
23.3us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
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After-tax earnings (loss) from operations (3.1)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
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(2.8)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
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(1.9)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
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Gain (loss) on sale, net of tax (7.6)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
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0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
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= alle_EMEIADivestitureUKDoorMember
0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
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Discontinued Operation, Tax Effect of Discontinued Operation 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
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0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
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0.4us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
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Discontinued operations, net of tax $ (10.7)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= alle_EMEIADivestitureUKDoorMember
$ (2.8)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= alle_EMEIADivestitureUKDoorMember
$ (1.5)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= alle_EMEIADivestitureUKDoorMember