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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Useful lives of property, plant and equipment
Property, plant and equipment, net consisted of the following:
(in millions)December 31,
2020
December 31,
2019
Land$534.7 $360.5 
Processing units, pipelines and equipment5,026.2 4,108.0 
Buildings and leasehold improvements127.0 64.6 
Computers, furniture and fixtures164.3 143.5 
Construction in progress199.2 312.2 
6,051.4 4,988.8 
Less—Accumulated depreciation(1,208.1)(965.6)
Total property, plant and equipment, net$4,843.3 $4,023.2 
Property, Plant and Equipment, Useful Lives
Depreciation is computed using the straight-line method over the following estimated useful lives:
Process units and equipment
5-25 years
Pipeline and equipment
5-25 years
Buildings
25 years
Computers, furniture and fixtures
3-7 years
Leasehold improvements
20 years
Railcars
50 years