Lease Obligations (Components Of Rental Expense) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases [Abstract]
Continuing operations	$ 52.1	$ 51.3	$ 51.2

Operating leases rent expense net continuing operations

No definition available.

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