CAPITAL STOCK AND STOCK AWARD PLANS - Summary of Performance Based Shares and Units by First Vesting Date (Details)	12 Months Ended
Dec. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares and stock units granted, net of forfeitures (in shares)	1,761,516
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 58.71
Unvested performance shares and restricted stock units (in shares)	1,215,459
December 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares and stock units granted, net of forfeitures (in shares)	387,587
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 46.50
Unvested performance shares and restricted stock units (in shares)	109,784
December 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares and stock units granted, net of forfeitures (in shares)	329,596
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 60.80
Unvested performance shares and restricted stock units (in shares)	175,904
December 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares and stock units granted, net of forfeitures (in shares)	392,990
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 51.88
Unvested performance shares and restricted stock units (in shares)	309,300
December 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares and stock units granted, net of forfeitures (in shares)	343,014
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 64.91
Unvested performance shares and restricted stock units (in shares)	312,142
December 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares and stock units granted, net of forfeitures (in shares)	308,329
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 74.19
Unvested performance shares and restricted stock units (in shares)	308,329

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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.

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No definition available.

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- Definition

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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