STOCK-BASED COMPENSATION - Schedule of Performance Cycles (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
3 year performance cycle, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
TSR Performance Relative to the Peer Group (1% Best)		78.00%
Payout as a Percent of the Base Award		0.00%
Number of Shares Distributed (less than) (in shares)		0.0
Cash Portion		$ 0.0
3 year performance cycle, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
TSR Performance Relative to the Peer Group (1% Best)	63.00%
Payout as a Percent of the Base Award	49.00%
Number of Shares Distributed (less than) (in shares)	0.1
Cash Portion	$ 1.6

Three year performance cycle Payout as a percent of the base award.

No definition available.

Name:	leg_ThreeYearPerformanceCyclePayoutAsPercentOfBaseAward
Namespace Prefix:	leg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Three year performance cycle total shareholder return performance relative to the peer group one percent equal to best.

+ References

No definition available.

+ Details

Name:	leg_ThreeYearPerformanceCycleTotalShareholderReturnPerformanceRelativeToPeerGroupOnePercentEqualToBest
Namespace Prefix:	leg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash paid to settle liability for award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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

- Details

Name:	us-gaap_AwardTypeAxis=leg_ThreeYearPerformanceCycleAwardYearTwoThousandSixteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=leg_ThreeYearPerformanceCycleAwardYearTwoThousandSeventeenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: