XML 78 R63.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Summary of Significant Accounting Policies (Product Warranties) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2024
Accounting Policies [Abstract] |
Minimum product warranty term | 1 year
Maximum product warranty term | 20 years

X
- Definition Maximum Product Warranties + References No definition available. + Details
Name: | lii_MaximumProductWarranties
Namespace Prefix: | lii_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum Product Warranties + References No definition available. + Details
Name: | lii_MinimumProductWarranties
Namespace Prefix: | lii_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration