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Earnings Per Unit (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Numerator: |  |  |  |
Net income attributable to limited partners | $ 552.5 | $ 566.3 | $ 1,306.0 | $ 1,217.6
Denominator: |  |  |  |
Distribution-bearing common units outstanding (in units) | 889.1 | 857.9 | 885.4 | 857.3
Basic earnings per unit: |  |  |  |
Net income attributable to limited partners, basic (in dollars per unit) | $ 0.62 | $ 0.66 | $ 1.48 | $ 1.42
Numerator: |  |  |  |
Net income attributable to limited partners | $ 552.5 | $ 566.3 | $ 1,306.0 | $ 1,217.6
Denominator: |  |  |  |
Distribution-bearing common units outstanding (in units) | 889.1 | 857.9 | 885.4 | 857.3
Class B units (in units) | 4.5 | 4.5 | 4.5 | 4.5
Designated Units (in units) | 23.7 | 26.1 | 23.7 | 26.1
Incremental option units (in units) | 1.2 | 1.4 | 1.2 | 1.4
Total (in units) | 918.5 | 889.9 | 914.8 | 889.3
Diluted earnings per unit: |  |  |  |
Net income attributable to limited partners, diluted (in dollars per unit) | $ 0.60 | $ 0.64 | $ 1.43 | $ 1.37

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Warrant -URI http://asc.fasb.org/extlink&oid=6528364 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1757-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Treasury Stock Method -URI http://asc.fasb.org/extlink&oid=6527216 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Call Option -URI http://asc.fasb.org/extlink&oid=6506649 + Details
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