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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plans [Abstract]
Expenses related to defined contribution plans and multiemployer plan	$ 9.7	$ 8.7	$ 8.0
Funded status	$ (79.6)	(92.0)
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"	$ (1.9)	(1.8)
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	1.4
Total market value of plan assets represented by LP common stock	8.50%
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	$ 9.0	$ 7.8

X

- Definition

Deferred Compensation Arrangement, Employer Contributions and Earnings, Maximum Vesting Period

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Deferred Compensation Arrangement, Maximum Deferral Percentage

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- Definition

Defined Contribution Plan, Number of Shares of Equity Securities Issued by Employer

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- Definition

Defined Benefit Plan, Percentage of Employer and Related Party Securities Included in Plan Assets

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

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- Definition

Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Amount of contributions made to multiemployer plan by employer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 80
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

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