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Reportable Business Segments (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Segment
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Number of reportable business segments 3us-gaap_NumberOfReportableSegments    
Revenue From Transactions With Major Customers $ 0lii_RevenueFromTransactionsWithMajorCustomers $ 0lii_RevenueFromTransactionsWithMajorCustomers $ 0lii_RevenueFromTransactionsWithMajorCustomers
Minimum Percentage Of Consolidated Net Sales From Single Customer 10.00%lii_MinimumPercentageOfConsolidatedNetSalesFromSingleCustomer 10.00%lii_MinimumPercentageOfConsolidatedNetSalesFromSingleCustomer 10.00%lii_MinimumPercentageOfConsolidatedNetSalesFromSingleCustomer
Capital Lease Obligations 0us-gaap_CapitalLeaseObligations 0us-gaap_CapitalLeaseObligations 0us-gaap_CapitalLeaseObligations
Income from Equity Method Investments 13,800,000us-gaap_IncomeLossFromEquityMethodInvestments 12,200,000us-gaap_IncomeLossFromEquityMethodInvestments 10,500,000us-gaap_IncomeLossFromEquityMethodInvestments
Residential Heating & Cooling and Commercial Heating & Cooling [Member]      
Segment Reporting Information [Line Items]      
Income from Equity Method Investments $ 11,700,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= lii_ResidentialHeatingAndCoolingAndCommercialHeatingAndCoolingMember		 [1] $ 9,600,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= lii_ResidentialHeatingAndCoolingAndCommercialHeatingAndCoolingMember		 [1] $ 5,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= lii_ResidentialHeatingAndCoolingAndCommercialHeatingAndCoolingMember		 [1]
[1] $11.7 million, $9.6 million and $5.0 million of income from equity method investments to our Residential Heating & Cooling and Commercial Heating & Cooling segments in 2014, 2013 and 2012, respectively. These allocations were recorded as reductions to the segments' Cost of goods sold in the Consolidated Statements of Operations.