Area of Leased Office Building

No definition available.

Name:	lii_AreaOfLeasedOfficeBuilding
Namespace Prefix:	lii_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

debt instrument, Covenant for debt not paid

+ References

No definition available.

+ Details

Name:	lii_DebtinstrumentCovenantfordebtnotpaid
Namespace Prefix:	lii_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Lessee, Operating Lease, Percentage Of Leases Relating To Real Estate

+ References

No definition available.

+ Details

Name:	lii_LesseeOperatingLeasePercentageOfLeasesRelatingToRealEstate
Namespace Prefix:	lii_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of Lease Balance as Final Payment End of Lease Term

+ References

No definition available.

+ Details

Name:	lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm
Namespace Prefix:	lii_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Purchase Price of Property at End of Lease Term

+ References

No definition available.

+ Details

Name:	lii_PurchasePriceOfPropertyAtEndOfLeaseTerm
Namespace Prefix:	lii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

+ Details

Name:	us-gaap_InsuranceRecoveries
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, before estimated recoveries from reinsurers.

+ 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 (cc)
-URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-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:	credit
Period Type:	instant

Commitments and Contingencies (Textuals) (Details) $ in Millions		12 Months Ended
	Mar. 01, 2019 USD ($) ft²	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Percentage of leases relating to real estate		81.00%
Accrued asbestos reserves		$ 14.3	$ 13.1
Lessee, operating lease, term of contract		5 years
Area of leased office building (in square feet) \| ft²	192,000
Purchase price of property at end of lease term	$ 41.2
Percentage of lease balance as final payment end of lease term	87.00%
Debt covenant, debt not paid when due	$ 75.0
Insurance recoveries received		$ 0.0	$ 6.6	$ 0.0