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Subsequent Event (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Subsequent Event [Line Items] |  |  |  |
Net income available to common unitholders (see Note 13) | $ 636.5 | $ 552.5 | $ 1,433.8 | $ 1,306.0
Basic earnings per unit: |  |  |  |
Weighted-average number of common units outstanding, as reported (in units) | 915.5 | 889.1 | 914.8 | 885.4
Basic earnings per unit, as reported (in dollars per unit) | $ 0.70 | $ 0.62 | $ 1.57 | $ 1.48
Diluted earnings per unit: |  |  |  |
Weighted-average number of common units outstanding, as reported (in units) | 940.2 | 918.5 | 939.1 | 914.8
Diluted earnings per unit, as reported (in dollars per unit) | $ 0.68 | $ 0.60 | $ 1.53 | $ 1.43
Subsequent Event [Member] |  |  |  |
Basic earnings per unit: |  |  |  |
Weighted-average number of common units outstanding, pro forma (in units) | 1,831.0 | 1,778.2 | 1,829.6 | 1,770.8
Basic earnings per unit, pro forma (in dollars per unit) | $ 0.35 | $ 0.31 | $ 0.78 | $ 0.74
Diluted earnings per unit: |  |  |  |
Weighted-average number of common units outstanding, pro forma (in units) | 1,880.4 | 1,837.0 | 1,878.2 | 1,829.6
Diluted earnings per unit, pro forma (in dollars per unit) | $ 0.34 | $ 0.30 | $ 0.76 | $ 0.71

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