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Stock-Based Compensation
6 Months Ended
Jun. 30, 2011
Stock-Based Compensation [Abstract]  
Stock-Based Compensation
11. Stock-Based Compensation:
     The Lennox International Inc. 2010 Incentive Plan, as amended and restated provides for various long-term incentive awards, which include stock options, performance share units, restricted stock units and stock appreciation rights. Net stock-based compensation expense recognized was as follows (in millions):
                                 
    For the Three Months     For the Six Months  
    Ended June 30,     Ended June 30,  
    2011     2010     2011     2010  
Net stock-based compensation expense
  $ 4.2     $ 3.4     $ 9.1     $ 7.7  
     These expenses are included in Selling, General and Administrative Expenses in the accompanying Consolidated Statements of Operations.