Consolidated Statements of Partners' Capital (USD $) In Millions, unless otherwise specified	Total	General Partner's Interests	Accumulated Other Comprehensive Income	Comprehensive Income	Common Units	Class B Common Units
Partners' capital balance at Dec. 31, 2008	$ 227.3	$ 39.2	$ (30.8)		$ 217.9	$ 1.0
Increase (Decrease) in Partners' Capital
Net earnings	144.3	42.9		144.3	100.0	1.4
Change in fair value of derivatives	34.0		34.0	34.0
Comprehensive income				178.3
Distributions	(264.3)	(96.6)			(165.1)	(2.6)
Partners' capital balance at Dec. 31, 2009	141.3	(14.5)	3.2		152.8	(0.2)
Increase (Decrease) in Partners' Capital
Net earnings	201.6	51.4		201.6	148.2	2.0
Change in fair value of derivatives	(3.2)		(3.2)	(3.2)
Comprehensive income				198.4
Distributions	(129.7)	(36.0)			(92.5)	(1.2)
Partners' capital balance at Dec. 31, 2010	210.0	0.9			208.5	0.6
Increase (Decrease) in Partners' Capital
Net earnings	508.0	219.4		508.0	283.6	5.0
Comprehensive income				508.0
Distributions	(448.7)	(186.9)			(257.3)	(4.5)
Partners' capital balance at Dec. 31, 2011	$ 269.3	$ 33.4	$ 0		$ 234.8	$ 1.1

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

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-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e540-108580

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

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 30

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Number 51

-Paragraph A5

-Appendix A

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-Number 51

-Paragraph 38

-Subparagraph c(3)

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-Paragraph 8, 9, 10, 11, 12, 13, 14

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6508144

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514

+ Details

- Definition

Net of tax effect change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges, that is attributable to the parent entity. The change includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

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-Subparagraph (c)(3)

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-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

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-Paragraph 30

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-Subparagraph c(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 29

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6921628&loc=SL4569643-111683

+ Details

- Definition

The amount of ownership interest of different classes of partners in limited partnership.

+ References+ Details

- Definition

Total distributions to each class of partners (i.e., general, limited and preferred partners).

+ References+ Details