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Inventories (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Available-for-Sale Inventory by Product Type [Abstract]          
NGLs $ 1,057.7   $ 1,057.7   $ 639.9
Petrochemicals and refined products 362.9   362.9   148.0
Crude oil 263.3   263.3   222.1
Natural gas 31.0   31.0   28.1
Total 1,714.9   1,714.9   $ 1,038.1
Summary of cost of sales and lower of cost or market adjustments [Abstract]          
Cost of sales [1] 3,838.7 $ 5,257.9 7,047.0 $ 10,936.0  
Lower of cost or market adjustments within cost of sales $ 0.8 $ 0.5 $ 6.1 $ 4.0  
[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.