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Discontinued Operations (Details Textual) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended 1 Months Ended
Mar. 22, 2013
Dec. 31, 2012
Apr. 30, 2012
Service Experts [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of business $ 10.4us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lii_ServiceExpertsMember
   
Service Experts [Member] | Goodwill in assets of discontinued operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Goodwill impairment   20.5us-gaap_GoodwillImpairmentLoss
/ us-gaap_BalanceSheetLocationAxis
= lii_GoodwillInAssetsOfDiscontinuedOperationsMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lii_ServiceExpertsMember
 
Hearth [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of business     10.1us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lii_HearthMember
Pre-tax charge for write-down of net assets to estimated fair market value   6.3lii_DisposalGroupIncludingDiscontinuedOperationLossGainOnWriteDown
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lii_HearthMember
 
Settlement charge related to recognized actuarial losses   6.3lii_SettlementChargeRelatedToRecognizedActuarialLosses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lii_HearthMember
 
Discontinued operation gain in settlement of foreign currency translation   $ 3.5us-gaap_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTranslationGainsLosses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lii_HearthMember