Stock-Based Compensation (Stock Units Converted To Common Stock) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Total intrinsic value of vested stock units converted to common stock	$ 10.5	$ 11.7	$ 8.0

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

No definition available.

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