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Inventories (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Available-for-Sale Inventory by Product Type [Abstract]      
NGLs $ 276.3   $ 593.8
Petrochemicals and refined products 399.3   395.1
Crude oil 287.9   42.6
Natural gas 14.4   61.6
Total 977.9   1,093.1
Summary of cost of sales and lower of cost or market adjustments [Abstract]      
Cost of sales 11,052.7 [1] 9,692.5 [1]  
Lower of cost or market adjustments $ 5.2 $ 2.7  
[1] Cost of sales is a component of "Operating costs and expenses," as presented on our Unaudited Condensed Statements of Consolidated Operations. Quarter-to-quarter fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.