XML 88 R76.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Reportable Business Segments (Segment Description) (Details) | 3 Months Ended
--- | ---
Mar. 31, 2018 Segment
Segment Reporting, Measurement Disclosures [Abstract] |
Number of reportable business segments | 3
Residential Heating & Cooling [Member] |
Segment Reporting Information [Line Items] |
Product or Services | Furnaces, air conditioners, heat pumps, packaged heating and cooling systems, indoor air quality equipment, comfort control products, replacement parts
Markets Served | Residential Replacement; Residential New Construction
Commercial Heating & Cooling [Member] |
Segment Reporting Information [Line Items] |
Product or Services | Unitary heating and air conditioning equipment, applied systems, controls, installation and service of commercial heating and cooling equipment
Markets Served | Light Commercial
Refrigeration [Member] |
Segment Reporting Information [Line Items] |
Product or Services | Condensing units, unit coolers, fluid coolers, air cooled condensers, air handlers, process chillers, controls, compressorized racks, supermarket display cases and systems
Markets Served | Light Commercial; Food Preservation; Non-Food/Industrial

X
- Definition Description of the types of products and services from which the reportable segment derives its revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 + Details
Name: | us-gaap_DescriptionOfTypesOfProductsAndServicesFromWhichEachReportableSegmentDerivesItsRevenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of the factors used to identify reportable segments, including the basis of organization (for example, whether management has chosen to organize the enterprise around differences in products and services, geographic areas, regulatory environments, or a combination of factors and whether operating segments have been aggregated to reportable segments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 + Details
Name: | us-gaap_FactorsUsedToIdentifyEntitysReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lii_ResidentialHeatingAndCoolingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lii_CommercialHeatingAndCoolingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lii_RefrigerationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |