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Inventories (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Available-for-Sale Inventory by Product Type [Abstract]          
NGLs $ 586.8   $ 586.8   $ 579.1
Petrochemicals and refined products 220.4   220.4   295.6
Crude oil 157.9   157.9   97.8
Natural gas 34.7   34.7   41.7
Total 999.8   999.8   $ 1,014.2
Summary of cost of sales and lower of cost or market adjustments [Abstract]          
Cost of sales [1] 5,257.9 $ 10,705.3 10,936.0 $ 21,758.0  
Lower of cost or market adjustments $ 0.5 $ 2.7 $ 4.0 $ 7.9  
[1] Cost of sales is a component of "Operating costs and expenses" as presented on our Unaudited Condensed Statements of Consolidated Operations. Fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.