Stock-Based Compensation (Number Of Shares And Related Grant Date Fair Value Of PSU) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date per share fair value (in dollars per share)	$ 30.10
Award Year 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 (in shares)			0.1
Cash Portion			$ 1.6
Award Year 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
TSR Performance Relative to the Peer Group (1%=Best)		60.00%
Payout as a Percent of the Base Award		56.00%
Number of Shares Distributed (in shares)		0.1
Cash Portion		$ 2.0
Award Year 2019
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 (in shares)	0.0
Cash Portion	$ 0.0
Award Year 2018, PSU - EBIT CAGR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout as a Percent of the Base Award		16.00%
Number of Shares Distributed (in shares)		0.1
Cash Portion		$ 0.4
Award Year 2019, PSU - EBIT CAGR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout as a Percent of the Base Award	127.00%
Number of Shares Distributed (in shares)	0.1
Cash Portion	$ 3.5
TSR Based \| Performance Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares base award (in shares)	0.1	0.1	0.1
Grant date per share fair value (in dollars per share)	$ 49.43	$ 38.23	$ 57.86
Risk-free interest rate	0.20%	1.40%	2.40%
Expected life in years	3 years	3 years	3 years
Expected volatility (over expected life)	44.30%	24.00%	21.50%
Expected dividend yield (over expected life)	3.70%	3.60%	3.40%
EBIT CAGR Based \| Performance Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares base award (in shares)	0.1	0.1	0.1
Grant date per share fair value (in dollars per share)	$ 38.77	$ 40.52	$ 39.98
Vesting period in years	3 years	3 years	3 years

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

No definition available.

Name:	leg_ThreeYearPerformanceCyclePayoutAsPercentOfBaseAward
Namespace Prefix:	leg_
Data Type:	dtr-types: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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

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

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ 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

+ Details

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

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
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

- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ 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 (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_VestingAxis=leg_RelativeTotalShareholderReturnMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_VestingAxis=leg_EarningsBeforeInterestandTaxesAndCompoundAnnualGrowthRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: