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Earnings Per Unit (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Numerator: |  |
Net income attributable to limited partners | $ 753.5 | $ 651.3
Denominator: |  |
Distribution-bearing common units outstanding (in units) | 881.6 | 856.6
Basic earnings per unit: |  |
Net income attributable to limited partners, basic (in dollars per unit) | $ 0.85 | $ 0.76
Numerator: |  |
Net income attributable to limited partners | $ 753.5 | $ 651.3
Denominator: |  |
Distribution-bearing common units outstanding (in units) | 881.6 | 856.6
Class B units (in units) | 4.5 | 4.5
Designated Units (in units) | 23.7 | 26.1
Incremental option units (in units) | 1.2 | 1.5
Total (in units) | 911.0 | 888.7
Diluted earnings per unit: |  |
Net income attributable to limited partners, diluted (in dollars per unit) | $ 0.83 | $ 0.73

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