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Earnings Per Unit | 3 Months Ended
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Mar. 31, 2013
Earnings Per Unit [Abstract] |
Earnings Per Unit | Note 13. Earnings Per Unit Basic earnings per unit is computed by dividing net income or loss attributable to our limited partners by the weighted-average number of our distribution-bearing units outstanding during a period, which excludes the Designated Units (see Note 10) to the extent such units do not participate in the distributions to be paid with respect to such period. Diluted earnings per unit is computed by dividing net income or loss attributable to our limited partners by the sum of (i) the weighted-average number of our distribution-bearing units outstanding during a period (as used in determining basic earnings per unit), (ii) the weighted-average number of our Class B units outstanding during a period, (iii) the weighted-average number of Designated Units outstanding during a period and (iv) the number of incremental common units resulting from the assumed exercise of dilutive unit options outstanding during a period (the "incremental option units"). The following table presents our calculation of basic and diluted earnings per unit for the periods indicated:
|  | For the Three Months Ended March 31, |
|  | 2013 |  |  | 2012 |
BASIC EARNINGS PER UNIT |  |  |  |  |  |
Numerator: |  |  |  |  |  |
Net income attributable to limited partners |  | $ | 753.5 |  |  | $ | 651.3 |
Denominator: |  |  |  |  |  |  |  |
Weighted-average number of distribution-bearing common units outstanding |  |  | 881.6 |  |  |  | 856.6 |
Basic earnings per unit: |  |  |  |  |  |  |  |
Net income attributable to limited partners |  | $ | 0.85 |  |  | $ | 0.76 |
DILUTED EARNINGS PER UNIT |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net income attributable to limited partners |  | $ | 753.5 |  |  | $ | 651.3 |
Denominator: |  |  |  |  |  |  |  |
Weighted-average number of units outstanding: |  |  |  |  |  |  |  |
Distribution-bearing common units |  |  | 881.6 |  |  |  | 856.6 |
Class B units |  |  | 4.5 |  |  |  | 4.5 |
Designated Units |  |  | 23.7 |  |  |  | 26.1 |
Incremental option units |  |  | 1.2 |  |  |  | 1.5 |
Total |  |  | 911.0 |  |  |  | 888.7 |
Diluted earnings per unit: |  |  |  |  |  |  |  |
Net income attributable to limited partners |  | $ | 0.83 |  |  | $ | 0.73 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -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 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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