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Inventories (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Inventory by Product Type [Abstract]      
NGLs $ 1,107.5   $ 1,156.1
Petrochemicals and refined products 474.2   220.7
Crude oil 319.5   360.0
Natural gas 20.8   33.7
Total 1,922.0   $ 1,770.5
Summary of cost of sales and lower of cost or net realizable value adjustments [Abstract]      
Cost of sales [1] 5,335.7 $ 3,208.3  
Lower of cost or net realizable value adjustments within cost of sales $ 3.4 $ 5.3  
[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.