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Lines of Credit and Financing Arrangements (Asset Securitization Program) (Details) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 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) | 1.90% | 1.66% |
Unused fee (as a percent) | 102.00% |  |
Fixed rate of agreement (as a percent) | 0.33% |  |
Unused fee charged on incremental available amounts (as a percent) | 0.05% |  |
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 |  |  | $ 200,000,000.0
Unused fee charged on incremental amount limit | $ 200,000,000 |  |
Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Securitization amount |  |  | $ 325,000,000.0

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 The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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

X
- 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: |

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