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v3.6.0.2

Subsequent Events (Details) - USD ($) shares in Millions, $ in Millions |  |  |  |  | 1 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 09, 2017 | Oct. 19, 2016 | Aug. 01, 2016 | Feb. 10, 2016 | Jul. 18, 2016
Subsequent Event [Line Items] |  |  |  |  |
Accelerated share repurchases, initial price to be paid |  |  | $ 100.0 | $ 200.0 |
Accelerated share repurchases, shares |  | 0.2 | 0.5 | 1.3 | 0.2
Accelerated share repurchases, percentages of shares to be repurchased |  |  | 75.00% | 75.00% |
Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Accelerated share repurchases, initial price to be paid | $ 75.0 |  |  |  |
Accelerated share repurchases, shares | 0.4 |  |  |  |
Accelerated share repurchases, percentages of shares to be repurchased | 85.00% |  |  |  |

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- Definition Accelerated Share Repurchases, Initial Price Paid + References No definition available. + Details
Name: | lii_AcceleratedShareRepurchasesInitialPricePaid
Namespace Prefix: | lii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Accelerated Share Repurchases, Number + References No definition available. + Details
Name: | lii_AcceleratedShareRepurchasesNumber
Namespace Prefix: | lii_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Accelerated Share Repurchases, Percentages of Shares to be Repurchased + References No definition available. + Details
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Namespace Prefix: | lii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |