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Equity-based Awards (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Equity-based compensation expense [Abstract] |  |  |  |  |  |
Total compensation expense | $ 60.0 |  | $ 50.9 |  | $ 70.4 |
Restricted Common Unit Awards [Member] |  |  |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |  |  |
Total compensation expense | 57.0 |  | 47.5 |  | 31.5 |
Unit Option Awards [Member] |  |  |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |  |  |
Total compensation expense | 1.3 |  | 3.1 |  | 3.4 |
Other Equity-based Awards [Member] |  |  |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |  |  |
Total compensation expense | 1.7 | [1] | 0.3 | [1] | 35.5 | [1]
Unit Appreciation Rights [Member] |  |  |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |  |  |
Total compensation expense | 0.9 |  | (0.4) |  | 3.1 |
Employee Partnerships [Member] |  |  |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |  |  |
Total compensation expense |  |  |  |  | $ 31.3 |
Long-Term Incentive Plan (1998) [Member] |  |  |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |  |  |
Maximum number of common units that may be issued as awards (in units) | 7,000,000 |  |  |  |  |
Remaining number of common units available to be issued as awards (in units) | 852,974 |  |  |  |  |
Long-Term Incentive Plan (2008) [Member] |  |  |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |  |  |
Maximum number of common units that may be issued as awards (in units) | 10,000,000 |  |  |  |  |
Remaining number of common units available to be issued as awards (in units) | 5,167,075 |  |  |  |  |
[1] | Primarily consists of unit appreciation rights ("UARs"), phantom units and similar awards. Also, the amounts presented for 2010 include $31.3 million of compensation expense for awards related to limited partnership interests in the Employee Partnerships, which were liquidated in August 2010.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -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 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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