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Employee Benefit Plans (Total Expense Defined Contribution Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
401(k) Plan	$ 8.0	$ 6.8	$ 6.8
Other defined contribution plans	4.8	4.6	4.9
Defined contribution plans	$ 12.8	$ 11.4	$ 11.7

X

- Definition

Defined Contribution Plan, Cost, 401K

+ References

No definition available.

+ Details

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Namespace Prefix:	leg_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Defined Contribution Plan, Cost, Other

+ References

No definition available.

+ Details

Name:	leg_DefinedContributionPlanCostOther
Namespace Prefix:	leg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Period Type:	duration