Represents the consecutive service period before retirement used in calculation of employee's highest compensation.

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- Definition

Represents the service period before retirement considered for calculation of employee's highest compensation.

+ References

No definition available.

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- Definition

Percentage of gross pay of employees with specified service period for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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- Definition

Represents the minimum service period which an employee required to complete for employer's specified matching contribution to a defined contribution plan.

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No definition available.

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- Definition

Represents the number of components of defined contribution plan or plans described.

+ References

No definition available.

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- Definition

Represents the number of coal reserve mines.

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No definition available.

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- Definition

Represents the percentage of ownership interest in coal lease.

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No definition available.

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Health Care Cost Trend Rate
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- Definition

The ultimate trend rate for health care costs.

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-SubTopic 20
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

+ References

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-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

The amount of the cost recognized during the period for defined contribution plans.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
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- Definition

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

+ References

No definition available.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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- Definition

Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 11
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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) item coal_mine	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected employer contributions to benefit plans in 2016	$ 4.0
Certain wholly owned subsidiaries including BORCO
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total costs of providing benefits	$ 1.4	$ 1.4	$ 1.2
Services company
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of components \| item	2
First component of RASP, percentage of eligible employee's covered salary	5.00%
Second component of RASP, percentage of employer's matching contribution	100.00%
Second component of RASP, percentage of eligible employee's covered salary (up to)	5.00%
Second component of RASP, percentage of gross pay of employees with specified service period for which employer contributes a matching contribution (up to)	6.00%
Second component of RASP, minimum service period required for employer's specified matching contribution	20 years
Total costs of RASP	$ 15.2	14.0	10.7
Total costs of providing benefits	$ 1.4	$ 1.0	$ 0.6
RIGP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Consecutive service period before retirement used in calculation of employee's highest compensation	5 years
Service period before retirement considered for calculation of employee's highest compensation	10 years
RIGP \| Coal lease
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Ownership interest percentage in coal lease	20.80%
Number of coal reserve mines \| coal_mine	2
Retiree Medical Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assumed annual increase in health care cost trend rate for 2016 (as a percent)	6.00%
Ultimate health care cost trend rate in 2021 and thereafter (as a percent)	4.50%