EMPLOYEE RETIREMENT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Weighted-average healthcare cost trend rate
Weighted-average healthcare cost trend rate (as a percent)	7.49%
Weighted-average healthcare cost trend rate in the year 2024 (as a percent)	4.50%
Pension Benefits
Components of net periodic benefit income (expense):
Interest cost	$ (7.9)	$ (5.6)
Service cost	(0.9)	(1.1)
Expected return on plan assets	11.8	7.3
Amortization of actuarial gain (loss)	0.1	(0.5)
Total net periodic benefit income (expense)	3.1	0.1
Assumptions used to determine net periodic benefit (income) cost
Discount rate (as a percent)	4.83%	4.16%
Expected return on assets (as a percent)	7.42%	6.91%
Rate of compensation increase (as a percent)	3.00%	3.14%
Contributions
Significant contributions to the pension plan trusts	0	0
Estimated payments for the current fiscal year	1.9
OPEB Benefits
Components of net periodic benefit income (expense):
Interest cost	(1.1)	(1.3)
Service cost	(0.2)	(0.4)
Amortization of prior service credit	2.3
Total net periodic benefit income (expense)	1.0	(1.7)
Assumptions used to determine net periodic benefit (income) cost
Discount rate (as a percent)	4.65%	4.39%
Rate of compensation increase (as a percent)	3.00%	3.11%
Contributions
Estimated payments for the current fiscal year	$ 7.8

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The amount of gains or losses recognized in net periodic benefit cost.

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The interest rate used to adjust for the time value of money.

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

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-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

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- Definition

Expected rate of compensation increases (for pay-related plans).

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

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- Definition

Amount of benefits expected to be paid in the remainder of the fiscal year following the latest fiscal year ended from a defined benefit plan.

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No definition available.

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Return on Plan Assets

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-Subparagraph (h)(3)

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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.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ 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 (h)(1)

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-Glossary Service Cost (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6525008

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 1

-Subparagraph (a)(1)

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- Definition

The ultimate trend rate for health care costs.

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