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Lines of Credit and Financing Arrangements (Asset Securitization Program) (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Jul. 05, 2016
Line of Credit Facility [Line Items] |  |  |
Maximum securitization as percentage of net pool balance | 100.00% |  |
Program fee percentage | 0.65% |  |
Average floating commercial paper rate (as a percent) | 1.70% | 1.66% |
Unused fee | 102.00% |  |
Fixed rate of agreement (as a percent) | 0.33% |  |
Unused fee charged on incremental available amounts (as a percent) | $ 0.0005 |  |
Senior Unsecured Notes [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Minimum principal amount accelerated | 75,000,000.0 |  |
Minimum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Securitization amount |  |  | $ 200,000,000
Unused fee charge on incremental amount | $ 200,000,000 |  |
Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Securitization amount |  |  | $ 325,000,000

X
- Definition Amount available under asset securitization. + References No definition available. + Details
Name: | lii_AmountAvailableUnderAssetSecuritization
Namespace Prefix: | lii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Asset Securitization Unused Fee Charge On Incremental Amount above + References No definition available. + Details
Name: | lii_AssetSecuritizationUnusedFeeChargeOnIncrementalAmountabove
Namespace Prefix: | lii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Average floating commercial paper rate. + References No definition available. + Details
Name: | lii_AverageFloatingCommercialPaperRate
Namespace Prefix: | lii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fixed rate of agreement. + References No definition available. + Details
Name: | lii_FixedRateOfAgreement
Namespace Prefix: | lii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum securitization as percentage of net pool balance. + References No definition available. + Details
Name: | lii_MaximumSecuritizationAsPercentageOfNetPoolBalance
Namespace Prefix: | lii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum amount of principal or interest due on indebtedness or receivable securitization. + References No definition available. + Details
Name: | lii_MinimumAmountOfPrincipalOrInterestDueOnIndebtednessOrReceivableSecuritization
Namespace Prefix: | lii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of maximum available amount used to charge unused fee. + References No definition available. + Details
Name: | lii_PercentageOfMaximumAvailableAmountUsedToChargeUnusedFee
Namespace Prefix: | lii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Program fee. + References No definition available. + Details
Name: | lii_ProgramFee
Namespace Prefix: | lii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of commitment fees for the unused borrowing capacity under the long-term financing arrangement that is available to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentUnusedBorrowingCapacityFee
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |