Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

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-Subparagraph (SAB TOPIC 14.F)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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UNIT-BASED COMPENSATION PLANS (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended					12 Months Ended		3 Months Ended
	Mar. 31, 2014 LTIP and Option Plan	Mar. 31, 2013 LTIP and Option Plan	Mar. 31, 2014 LTIP	Mar. 31, 2014 LTIP Phantom Stock Units Employee	Mar. 31, 2014 LTIP Phantom Stock Units Employee 2012 and 2011 Deferred Awards	Dec. 31, 2013 LTIP Phantom Stock Units Employee 2012 and 2011 Deferred Awards	Dec. 31, 2012 LTIP Phantom Stock Units Employee 2012 and 2011 Deferred Awards	Mar. 31, 2014 LTIP Phantom Stock Units Independent directors	Mar. 31, 2014 LTIP Performance Shares Employee	Mar. 31, 2014 LTIP Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Compensation expense	$ 3.1	$ 3.2
LP Units, available for issuance										2,926,789
Compensation awards deferred						$ 2.7	$ 1.4
Awards granted			381,000	196,247	75,870	51,668		16,000	169,059