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Retirement Plans and Post Retirement Benefits Defined Contribution Plans and Other Benefit Plans (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Plans [Abstract]      
Expenses related to defined contribution plans and multiemployer plan $ 8.7 $ 8.0 $ 5.6
Funded status $ (92.0) (93.4)  
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" $ (1.8) (2.0)  
US Defined Contribution Plan [Member]      
Defined Contribution Plans [Abstract]      
Maximum percentage of employee's wages eligible for company match 5.00%    
Shares of LP common stock included in plan assets 1.9    
Total market value of plan assets represented by LP common stock 10.00%    
Canadian Defined Contribution Plan [Member]      
Defined Contribution Plans [Abstract]      
Maximum percentage of employee's wages eligible for company match 3.00%    
Percentage of base contribution 2.50%    
Employer matching percentage 50.00%    
Other Postretirement Benefits      
Defined Contribution Plans [Abstract]      
Funded status $ 7.8 $ 7.5