XML 137 R122.htm IDEA: XBRL DOCUMENT
v3.20.4

Lines of Credit and Financing Arrangements (Senior Unsecured Notes) (Details) - Senior Unsecured Notes [Member] - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Jul. 30, 2017 | Nov. 01, 2016
Debt Instrument [Line Items] |  |  |
Fixed interest rate for senior unsecured notes |  |  | 3.00%
Minimum amount of principal or interest due on indebtedness or receivable securitization | $ 75,000,000 |  |
Number of days within notice date acceleration is not rescinded | 30 days |  |
2025 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issued |  | $ 300.0 |
Fixed interest rate for senior unsecured notes |  | 1.35% |
2027 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate for senior unsecured notes |  | 1.70% |
2023 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issued |  |  | $ 350,000,000.0

X
- Definition Debt Instrument, Cross Default Provision, Maximum Term if Acceleration is not Rescinded + References No definition available. + Details
Name: | lii_DebtInstrumentCrossDefaultProvisionMaximumTermifAccelerationisnotRescinded
Namespace Prefix: | lii_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum amount of principal or interest due on indebtedness or receivable securitization. + References No definition available. + Details
Name: | lii_MinimumAmountOfPrincipalOrInterestDueOnIndebtednessOrReceivableSecuritization
Namespace Prefix: | lii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=lii_A2025NotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=lii_A2027NotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=lii_A2023NotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |