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Business Segments, Consolidated Revenues and Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Consolidated Revenues [Abstract]        
Total consolidated revenues $ 5,617.8 $ 7,092.5 $ 10,623.1 $ 14,565.0
Operating costs and expenses:        
Cost of sales [1] 3,838.7 5,257.9 7,047.0 10,936.0
Other operating costs and expenses [2] 601.3 632.5 1,175.1 1,192.3
Depreciation, amortization and accretion 360.3 385.6 718.5 730.9
Asset impairment charges 13.1 79.0 14.8 112.3
Loss due to Pascagoula fire 7.1 0.0 7.1 0.0
Net losses attributable to asset sales 1.7 2.5 6.6 2.4
General and administrative costs 35.1 44.9 79.0 94.2
Total consolidated costs and expenses 4,857.3 6,402.4 9,048.1 13,068.1
NGL Pipelines & Services [Member]        
Consolidated Revenues [Abstract]        
Sales of NGLs and related products 2,060.4 1,849.1 4,003.9 4,091.3
Midstream services 455.1 417.0 915.4 851.1
Total consolidated revenues 2,515.5 2,266.1 4,919.3 4,942.4
Crude Oil Pipelines & Services [Member]        
Consolidated Revenues [Abstract]        
Sales of crude oil 1,482.2 2,971.3 2,603.3 5,542.0
Midstream services 177.8 117.1 345.3 224.4
Total consolidated revenues 1,660.0 3,088.4 2,948.6 5,766.4
Natural Gas Pipelines & Services [Member]        
Consolidated Revenues [Abstract]        
Sales of natural gas 305.7 429.9 620.7 906.2
Midstream services 230.0 254.8 465.0 512.4
Total consolidated revenues 535.7 684.7 1,085.7 1,418.6
Petrochemical & Refined Products Services [Member]        
Consolidated Revenues [Abstract]        
Sales of petrochemicals and refined products 713.4 832.7 1,266.6 1,983.7
Midstream services 193.2 185.8 402.9 383.9
Total consolidated revenues 906.6 1,018.5 1,669.5 2,367.6
Offshore Pipelines & Services [Member]        
Consolidated Revenues [Abstract]        
Sales of crude oil 0.0 1.7 0.0 2.8
Midstream services 0.0 33.1 0.0 67.2
Total consolidated revenues $ 0.0 $ 34.8 $ 0.0 $ 70.0
[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.
[2] Represents the cost of operating our plants, pipelines and other fixed assets excluding: depreciation, amortization and accretion charges; asset impairment charges; losses due to property damage events (e.g., the fire at our Pascagoula facility (see Note 4)); and net losses (or gains) attributable to asset sales.