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Commitments and Contingencies Expenses for asbestos- related litigation (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Asbestos related litigation [Abstract] |  |
Liability for Asbestos and Environmental Claims, Net, Incurred Loss | $ 1.7 | $ 1.1

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- Definition Asbestos related litigation [Abstract] + References No definition available. + Details
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Namespace Prefix: | lii_
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Balance Type: | na
Period Type: | duration

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- Definition Amount, after effects of reinsurance, of expense for claims incurred and costs incurred in the claim settlement process attributable to asbestos and environmental claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration