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Earnings Per Unit (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to limited partners |  |  |  |  |  |  |  |  | $ 2,596.9 | $ 2,419.9 | $ 2,046.9
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of distribution-bearing common units outstanding (in units) |  |  |  |  |  |  |  |  | 894.0 | 861.8 | 824.6
Basic earnings per unit: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to limited partners, basic (in dollars per unit) | $ 0.77 | $ 0.66 | $ 0.62 | $ 0.85 | $ 0.70 | $ 0.68 | $ 0.66 | $ 0.76 | $ 2.90 | $ 2.81 | $ 2.48
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to limited partners |  |  |  |  |  |  |  |  | $ 2,596.9 | $ 2,419.9 | $ 2,046.9
Denominator: |  |  |  |  |  |  |  |  |  |  |
Distribution-bearing common units outstanding (in units) |  |  |  |  |  |  |  |  | 894.0 | 861.8 | 824.6
Class B units (in units) |  |  |  |  |  |  |  |  | 2.7 | 4.5 | 4.5
Designated Units (in units) |  |  |  |  |  |  |  |  | 23.4 | 25.5 | 29.5
Incremental option units (in units) |  |  |  |  |  |  |  |  | 1.2 | 1.4 | 1.3
Total (in units) |  |  |  |  |  |  |  |  | 921.3 | 893.2 | 859.9
Diluted earnings per unit: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to limited partners, diluted (in dollars per unit) | $ 0.75 | $ 0.64 | $ 0.60 | $ 0.83 | $ 0.68 | $ 0.66 | $ 0.64 | $ 0.73 | $ 2.82 | $ 2.71 | $ 2.38

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