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Equity-based Awards (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Equity-based compensation expense [Abstract] |  |  |  |  |  |  |  |
Total compensation expense | $ 18.6 |  | $ 16.5 |  | $ 35.8 |  | $ 32.9 |
Restricted Common Unit Awards [Member] |  |  |  |  |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |  |  |  |  |
Total compensation expense | 18.3 |  | 15.7 |  | 34.9 |  | 30.5 |
Unit Option Awards [Member] |  |  |  |  |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |  |  |  |  |
Total compensation expense | 0.2 |  | 0.3 |  | 0.6 |  | 1.0 |
Other Equity-based Awards [Member] |  |  |  |  |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |  |  |  |  |
Total compensation expense | $ 0.1 | [1] | $ 0.5 | [1] | $ 0.3 | [1] | $ 1.4 | [1]
Long-Term Incentive Plan (1998) [Member] |  |  |  |  |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |  |  |  |  |
Remaining number of common units available to be issued as awards (in units) | 1,155,077 |  |  |  | 1,155,077 |  |  |
Long-Term Incentive Plan (2008) [Member] |  |  |  |  |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |  |  |  |  |
Remaining number of common units available to be issued as awards (in units) | 4,307,512 |  |  |  | 4,307,512 |  |  |
[1] | Primarily represents expense associated with unit appreciation rights ("UARs"), phantom units and similar awards.

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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 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 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + 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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