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Earnings Per Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
BASIC EARNINGS PER UNIT |  |  |  |  |
Net income attributable to limited partners |  | $ 558.5 | $ 551.0 | $ 1,219.7 | $ 1,187.1
Undistributed earnings allocated and cash payments on phantom unit awards | [1] | (3.3) | (2.2) | (6.5) | (4.4)
Net income available to common unitholders |  | $ 555.2 | $ 548.8 | $ 1,213.2 | $ 1,182.7
Basic weighted-average number of common units outstanding (in units) |  | 2,085.1 | 1,960.7 | 2,059.3 | 1,943.7
Basic earnings per unit (in dollars per unit) |  | $ 0.27 | $ 0.28 | $ 0.59 | $ 0.61
DILUTED EARNINGS PER UNIT |  |  |  |  |
Net income attributable to limited partners |  | $ 558.5 | $ 551.0 | $ 1,219.7 | $ 1,187.1
Diluted weighted-average number of units outstanding: |  |  |  |  |
Distribution-bearing common units (in units) |  | 2,085.1 | 1,960.7 | 2,059.3 | 1,943.7
Designated Units (in units) |  | 0.0 | 35.4 | 0.0 | 35.4
Phantom units (in units) | [1] | 8.1 | 5.9 | 7.5 | 5.2
Incremental option units (in units) |  | 0.0 | 0.1 | 0.0 | 0.2
Total (in units) |  | 2,093.2 | 2,002.1 | 2,066.8 | 1,984.5
Diluted earnings per unit (in dollars per unit) |  | $ 0.27 | $ 0.28 | $ 0.59 | $ 0.60
[1] | Each phantom unit award includes a DER, which entitles the recipient to receive cash payments equal to the product of the number of phantom unit awards and the cash distribution per unit paid to our common unitholders. Cash payments made in connection with DERs are nonforfeitable. As a result, the phantom units are considered participating securities for purposes of computing basic earnings per unit.

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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 -Topic 260 -SubTopic 10 -Section 45 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1757-109256 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Call Option -URI http://asc.fasb.org/extlink&oid=6506649 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Warrant -URI http://asc.fasb.org/extlink&oid=6528364 + Details
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