Lines of Credit and Financing Arrangements (Details 3)	Jun. 30, 2011	Dec. 31, 2010
Weighted average borrowing rate on the facility
Weighted average borrowing rate	1.01%	0.96%

Name:

lii_LineOfCreditFacilityWeightedAverageBorrowingRate

Namespace Prefix:

lii

Data Type:

us-types:percentItemType

Balance Type:

na

Period Type:

instant