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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
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Dec. 31, 2019 | Dec. 31, 2018
Defined Contribution Plans [Abstract] |  |
Expenses related to defined contribution plans and multiemployer plan | $ 10.0 |
Funded status | $ (18.0) | $ (22.0)
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" | $ (2.0) | $ (1.0)
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 |
Total market value of plan assets represented by LP common stock | 7.00% |
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 | 3.00% |
Employer matching percentage | 50.00% |
Non-US |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |
Defined Benefit Plan, Actual Plan Asset Allocation | 100.00% | 100.00%
Non-US | Debt Securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 90.00% |
Defined Benefit Plan, Actual Plan Asset Allocation | 90.00% | 90.00%
Non-US | Cash and Cash Equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 10.00% |
Defined Benefit Plan, Actual Plan Asset Allocation | 10.00% | 10.00%
UNITED STATES |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |
Defined Benefit Plan, Actual Plan Asset Allocation | 100.00% | 100.00%
UNITED STATES | Equity Securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 40.00% |
Defined Benefit Plan, Actual Plan Asset Allocation | 40.00% | 26.00%
UNITED STATES | Debt Securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 40.00% |
Defined Benefit Plan, Actual Plan Asset Allocation | 40.00% | 52.00%
UNITED STATES | Multi-strategy Funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 20.00% |
Defined Benefit Plan, Actual Plan Asset Allocation | 20.00% | 22.00%
Other Postretirement Benefits Plan [Member] |  |
Defined Contribution Plans [Abstract] |  |
Funded status | $ 7.0 | $ 9.0

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