XML 82 R67.htm IDEA: XBRL DOCUMENT
v3.20.4

Reportable Business Segments (Capital Expenditures by Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Payments to Acquire Property, Plant, and Equipment | $ 78.5 | $ 105.6 | $ 95.2
Residential Heating and Cooling [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Payments to Acquire Property, Plant, and Equipment | 44.0 | 59.2 | 45.2
Commercial Heating and Cooling [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Payments to Acquire Property, Plant, and Equipment | 5.9 | 11.3 | 12.5
Refrigeration [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Payments to Acquire Property, Plant, and Equipment | 9.2 | 9.4 | 9.3
Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Payments to Acquire Property, Plant, and Equipment | $ 19.4 | $ 25.7 | $ 28.2

X
- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
- 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: |

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