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Lines of Credit and Financing Arrangements (Required Ratios Under the Domestic Credit Facility) (Details) - Revolving Credit Facility [Member] | 12 Months Ended
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Dec. 31, 2018
Maximum [Member] |
Line of Credit Facility [Line Items] |
Consolidated Indebtedness to Adjusted EBITDA Ratio no greater than | 3.5
Minimum [Member] |
Line of Credit Facility [Line Items] |
Cash Flow to Interest Expense Ratio no less than | 3.0

X
- Definition Debt Instrument, Cash Flow To Net Interest Expense Ratio + References No definition available. + Details
Name: | lii_DebtInstrumentCashFlowToNetInterestExpenseRatio
Namespace Prefix: | lii_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Indebtedness To Adjusted EBITDA Ratio + References No definition available. + Details
Name: | lii_DebtInstrumentIndebtednessToAdjustedEBITDARatio
Namespace Prefix: | lii_
Data Type: | xbrli:pureItemType
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_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |