Stock-Based Compensation (Stock Units Converted To Common Stock) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Total intrinsic value of vested stock units converted to common stock	$ 0.0	$ 0.1	$ 1.9

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fully Vested, Intrinsic Value, Total

No definition available.

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