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Inventories (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Available-for-Sale Inventory by Product Type [Abstract]          
NGLs $ 799.1   $ 799.1   $ 594.3
Petrochemicals and refined products 394.0   394.0   304.5
Crude oil 156.9   156.9   119.4
Natural gas 61.4   61.4   70.2
Total 1,411.4   1,411.4   1,088.4
Summary of cost of sales and lower of cost or market adjustments [Abstract]          
Cost of sales 9,458.3 [1] 8,195.2 [1] 19,150.8 [1] 17,861.0 [1]  
Lower of cost or market adjustments $ 7.7 $ 8.0 $ 10.4 $ 13.9  
[1] Cost of sales is a component of "Operating costs and expenses," as presented on our Unaudited Condensed Statements of Consolidated Operations. Period-to-period fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.