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Business Segments, Consolidated Revenues and Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Consolidated Revenues [Abstract]    
Total consolidated revenues $ 7,320.4 $ 5,005.3
Operating costs and expenses:    
Cost of sales [1] 5,335.7 3,208.3
Other operating costs and expenses [2] 610.4 573.8
Depreciation, amortization and accretion 376.2 358.2
Impairment and related charges 11.2 1.7
Net losses (gains) attributable to asset sales (0.3) 4.9
General and administrative costs 50.4 43.9
Total consolidated costs and expenses 6,383.6 4,190.8
NGL Pipelines & Services [Member]    
Consolidated Revenues [Abstract]    
Sales of NGLs and related products 2,887.2 1,943.5
Midstream services 458.6 460.3
Total consolidated revenues 3,345.8 2,403.8
Crude Oil Pipelines & Services [Member]    
Consolidated Revenues [Abstract]    
Sales of crude oil 1,618.6 1,121.1
Midstream services 188.6 167.5
Total consolidated revenues 1,807.2 1,288.6
Natural Gas Pipelines & Services [Member]    
Consolidated Revenues [Abstract]    
Sales of natural gas 544.0 315.0
Midstream services 217.2 235.0
Total consolidated revenues 761.2 550.0
Petrochemical & Refined Products Services [Member]    
Consolidated Revenues [Abstract]    
Sales of petrochemicals and refined products 1,211.1 553.2
Midstream services 195.1 209.7
Total consolidated revenues $ 1,406.2 $ 762.9
[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.
[2] Represents the cost of operating our plants, pipelines and other fixed assets excluding: depreciation, amortization and accretion charges; asset impairment and related charges; and net losses (or gains) attributable to asset sales.