FAIR VALUE - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Fixed rate debt (less) greater than carrying value	$ (230.0)	$ 130.0
Fixed rate debt carrying value	$ 1,784.0	$ 2,082.3

Fixed Rate Debt, Amount Greater (Less) Than Carrying Value Net

No definition available.

Name:	leg_FixedRateDebtAmountGreaterLessThanCarryingValueNet
Namespace Prefix:	leg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant