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Inventories (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Inventory by Product Type [Abstract]          
NGLs $ 1,527.8   $ 1,527.8   $ 1,156.1
Petrochemicals and refined products 223.4   223.4   220.7
Crude oil 211.9   211.9   360.0
Natural gas 20.1   20.1   33.7
Total 1,983.2   1,983.2   $ 1,770.5
Summary of cost of sales and lower of cost or net realizable value adjustments [Abstract]          
Cost of sales [1] 5,049.6 $ 4,088.6 15,116.4 $ 11,135.6  
Lower of cost or net realizable value adjustments within cost of sales $ 1.7 $ 1.5 $ 7.7 $ 7.6  
[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.