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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |  |
Defined Benefit Plan, Actual Plan Asset Allocation | 1.00% | 0.00% |
Defined Contribution Plans [Abstract] |  |  |
Expenses related to defined contribution plans and multiemployer plan | $ 9.0 | $ 10.0 | $ 10.0
Funded status | $ (10.0) | (18.0) |
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) | $ (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 | 1,000,000 |  |
Total market value of plan assets represented by LP common stock | 8.00% |  |
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% |  |
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 | 33.00% |  |
Defined Benefit Plan, Actual Plan Asset Allocation | 41.00% | 40.00% |
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 | 50.00% |  |
Defined Benefit Plan, Actual Plan Asset Allocation | 38.00% | 40.00% |
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 | 17.00% |  |
Defined Benefit Plan, Actual Plan Asset Allocation | 20.00% | 20.00% |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Contribution Plans [Abstract] |  |  |
Funded status | $ 10.0 | $ 7.0 |

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