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Business Segments, Consolidated Revenues and Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Consolidated Revenues [Abstract]        
Total consolidated revenues $ 6,886.9 $ 5,920.4 $ 20,814.9 $ 16,543.5
Operating costs and expenses:        
Cost of sales [1] 5,049.6 4,088.6 15,116.4 11,135.6
Other operating costs and expenses [2] 637.4 612.1 1,853.4 1,787.2
Depreciation, amortization and accretion 383.9 367.1 1,139.3 1,085.6
Asset impairment and related charges 10.0 6.8 35.2 28.7
Net gains attributable to asset sales (1.1) (8.9) (1.1) (2.3)
General and administrative costs 41.3 42.0 137.4 121.0
Total consolidated costs and expenses 6,121.1 5,107.7 18,280.6 14,155.8
NGL Pipelines & Services [Member]        
Consolidated Revenues [Abstract]        
Sales of NGLs and related products 2,415.3 1,959.0 7,460.5 5,962.9
Midstream services 499.0 457.9 1,420.2 1,373.3
Total consolidated revenues 2,914.3 2,416.9 8,880.7 7,336.2
Crude Oil Pipelines & Services [Member]        
Consolidated Revenues [Abstract]        
Sales of crude oil 1,589.0 1,538.5 4,912.7 4,141.8
Midstream services 207.7 184.5 590.8 529.8
Total consolidated revenues 1,796.7 1,723.0 5,503.5 4,671.6
Natural Gas Pipelines & Services [Member]        
Consolidated Revenues [Abstract]        
Sales of natural gas 568.9 483.7 1,673.5 1,104.4
Midstream services 227.7 230.5 670.5 695.5
Total consolidated revenues 796.6 714.2 2,344.0 1,799.9
Petrochemical & Refined Products Services [Member]        
Consolidated Revenues [Abstract]        
Sales of petrochemicals and refined products 1,194.2 871.3 3,519.4 2,137.9
Midstream services 185.1 195.0 567.3 597.9
Total consolidated revenues $ 1,379.3 $ 1,066.3 $ 4,086.7 $ 2,735.8
[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.