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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property, plant and equipment and accumulated depreciation [Abstract]        
Property, plant and equipment, gross   $ 57,823.6   $ 57,497.5
Less accumulated depreciation   15,805.9   15,584.7
Subtotal property, plant, and equipment, net   42,017.7   41,912.8
Capitalized major maintenance costs for reaction-based plants, net of accumulated amortization [1]   84.7   0.0
Property, plant and equipment, net   42,102.4   41,912.8
Summary of depreciation expense and capitalized interest [Abstract]        
Depreciation expense [2]   423.7 $ 412.2  
Capitalized interest [3]   19.6 30.5  
Asset Retirement Obligations [Roll Forward]        
Balance at beginning of period $ 150.1 149.5    
Liabilities incurred   0.0    
Liabilities settled   0.0    
Revisions in estimated cash flows   (1.1)    
Accretion expense   1.7 1.8  
Balance at end of period   150.1    
Asset retirement obligation, current liability   11.3    
Asset retirement obligations, long-term liability   138.8    
Capitalized costs, asset retirement costs   69.0   69.7
Long Lived Assets Held-for-sale [Line Items]        
Impairment of intangible assets   6.8    
Proceeds from asset sales   6.2 $ 0.6  
Plants, pipelines and facilities [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Property, plant and equipment, gross [4]   $ 50,036.0   49,972.8
Plants, pipelines and facilities [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life [4],[5]   3 years    
Plants, pipelines and facilities [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life [4],[5]   45 years    
Underground and other storage facilities [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Property, plant and equipment, gross [6]   $ 4,231.4   4,207.5
Underground and other storage facilities [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life [6],[7]   5 years    
Underground and other storage facilities [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life [6],[7]   40 years    
Transportation equipment [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Property, plant and equipment, gross [8]   $ 199.2   204.9
Transportation equipment [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life [8]   3 years    
Transportation equipment [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life [8]   10 years    
Marine vessels [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Property, plant and equipment, gross [9]   $ 929.6   932.7
Marine vessels [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life [9]   15 years    
Marine vessels [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life [9]   30 years    
Land [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Property, plant and equipment, gross   $ 372.1   371.9
Construction in progress [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Property, plant and equipment, gross   $ 2,055.3   $ 1,807.7
Processing plants [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   20 years    
Processing plants [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   35 years    
Pipelines and related equipment [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   5 years    
Pipelines and related equipment [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   45 years    
Terminal facilities [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   10 years    
Terminal facilities [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   35 years    
Buildings [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   20 years    
Buildings [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   40 years    
Office furniture and equipment [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   3 years    
Office furniture and equipment [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   20 years    
Laboratory and shop equipment [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   5 years    
Laboratory and shop equipment [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   35 years    
Underground storage facilities [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   5 years    
Underground storage facilities [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   35 years    
Storage tanks [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   10 years    
Storage tanks [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   40 years    
Water wells [Member] | Minimum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   5 years    
Water wells [Member] | Maximum [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Estimated useful life   35 years    
Capitalized Major Maintenance [Member] | Weighted Average [Member]        
Property, plant and equipment and accumulated depreciation [Abstract]        
Expected remaining amortization period   2 years 9 months 18 days    
Coal bed natural gas gathering system and related Val Verde treating facility [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Impairment of long-lived assets held for sale   $ 43.4    
Impairment of property, plant and equipment   36.6    
Impairment of intangible assets   $ 6.8    
Coal bed natural gas gathering system and related Val Verde treating facility [Member] | Subsequent Event [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Proceeds from asset sales $ 40.0      
[1] For reaction-based plants, we use the deferral method when accounting for major maintenance activities.  Under the deferral method, major maintenance costs are capitalized and amortized over the period until the next major overhaul project.   On a weighted-average basis, the expected amortization period for these costs is 2.8 years.
[2] Depreciation and accretion expense is a component of “Costs and expenses” as presented on our Unaudited Condensed Statements of Consolidated Operations.
[3] We capitalize interest costs incurred on funds used to construct property, plant and equipment while the asset is in its construction phase.  The capitalized interest is recorded as part of the asset to which it relates and is amortized over the asset’s estimated useful life as a component of depreciation expense.  When capitalized interest is recorded, it reduces interest expense from what it would be otherwise.
[4] Plants, pipelines and facilities include processing plants; NGL, natural gas, crude oil and petrochemical and refined products pipelines; terminal loading and unloading facilities; buildings; office furniture and equipment; laboratory and shop equipment and related assets.
[5] In general, the estimated useful lives of major assets within this category are: processing plants, 20-35 years; pipelines and related equipment, 5-45 years; terminal facilities, 10-35 years; buildings, 20-40 years; office furniture and equipment, 3-20 years; and laboratory and shop equipment, 5-35 years.
[6] Underground and other storage facilities include underground product storage caverns; above ground storage tanks; water wells and related assets.
[7] In general, the estimated useful lives of assets within this category are: underground storage facilities, 5-35 years; storage tanks, 10-40 years; and water wells, 5-35 years.
[8] Transportation equipment includes tractor-trailer tank trucks and other vehicles and similar assets used in our operations.
[9] Marine vessels include tow boats, barges and related equipment used in our marine transportation business.