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Retirement Plans and Post Retirement Benefits Defined Contribution Plans and Other Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
U.S. 401(k) Plans [Member]
Dec. 31, 2008
U.S. 401(k) Plans [Member]
Dec. 31, 2011
Canada Defined Contribution Plans [Member]
Dec. 31, 2011
Other Postretirement Benefits [Member]
Dec. 31, 2010
Other Postretirement Benefits [Member]
Defined Contribution Plans [Abstract]                
Maximum percentage of employee's wages eligible for company match       2.00% 3.50% 3.00%    
Shares of LP common stock included in plan assets       3.6        
Total market value of plan assets represented by LP common stock       13.20%        
Percentage of base contribution           2.50%    
Employer matching percentage           50.00%    
Expenses related to defined contribution plans and multiemployer plan $ 5.5 $ 4.2 $ 2.2          
Funded status (92.2) (61.0)         8.5 8.5
Deferred Compensation Arrangements [Abstract]                
Deferred compensation plan maximum deferral percentage 90.00%              
Deferred compensation plan, employer contributions and related earnings, maximum vesting period 5 years              
Deferred compensation liability included in "Other long-term liabilities" $ 2.1 $ 2.1