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Intangible Assets and Goodwill (Tables)
 12 Months Ended
Dec. 31, 2020
Intangible Assets and Goodwill [Abstract]  
Intangible Assets by Segment
The following table summarizes our intangible assets by business segment at the dates indicated:

 
  
December 31, 2020
    
December 31, 2019
  
 
  
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
    
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
  
NGL Pipelines & Services:
                                    
Customer relationship intangibles
  
$
447.8
    
$
(221.3
)
  
$
226.5
    
$
447.8
    
$
(206.3
)
  
$
241.5
  
Contract-based intangibles
    
162.6
      
(55.0
)
    
107.6
      
162.6
      
(43.9
)
    
118.7
  
Segment total
    
610.4
      
(276.3
)
    
334.1
      
610.4
      
(250.2
)
    
360.2
  
Crude Oil Pipelines & Services:
                                                
Customer relationship intangibles
    
2,195.0
      
(291.6
)
    
1,903.4
      
2,203.5
      
(243.5
)
    
1,960.0
  
Contract-based intangibles
    
283.1
      
(249.9
)
    
33.2
      
276.9
      
(235.0
)
    
41.9
  
Segment total
    
2,478.1
      
(541.5
)
    
1,936.6
      
2,480.4
      
(478.5
)
    
2,001.9
  
Natural Gas Pipelines & Services:
                                                
Customer relationship intangibles
    
1,350.3
      
(512.2
)
    
838.1
      
1,350.3
      
(481.6
)
    
868.7
  
Contract-based intangibles
    
470.7
      
(403.8
)
    
66.9
      
468.0
      
(395.5
)
    
72.5
  
Segment total
    
1,821.0
      
(916.0
)
    
905.0
      
1,818.3
      
(877.1
)
    
941.2
  
Petrochemical & Refined Products Services:
                                                
Customer relationship intangibles
    
181.4
      
(68.3
)
    
113.1
      
181.4
      
(57.5
)
    
123.9
  
Contract-based intangibles
    
44.9
      
(24.6
)
    
20.3
      
46.0
      
(24.2
)
    
21.8
  
Segment total
    
226.3
      
(92.9
)
    
133.4
      
227.4
      
(81.7
)
    
145.7
  
Total intangible assets
  
$
5,135.8
    
$
(1,826.7
)
  
$
3,309.1
    
$
5,136.5
    
$
(1,687.5
)
  
$
3,449.0
  
Amortization Expense of Intangible Assets by Segment
The following table presents the amortization expense of our intangible assets by business segment for the years indicated:

 
  
For the Year Ended December 31,
  
 
  
2020
    
2019
    
2018
  
NGL Pipelines & Services
  
$
25.2
    
$
31.9
    
$
34.7
  
Crude Oil Pipelines & Services
    
71.5
      
92.7
      
87.8
  
Natural Gas Pipelines & Services
    
38.8
      
41.4
      
39.1
  
Petrochemical & Refined Products Services
    
7.7
      
8.7
      
8.7
  
Total
  
$
143.2
    
$
174.7
    
$
170.3
  
Forecasted Amortization Expense
The following table presents our forecast of amortization expense associated with existing intangible assets for the years indicated:

2021
    
2022
    
2023
    
2024
    
2025
  
$
144.5
    
$
161.3
    
$
169.0
    
$
165.1
    
$
163.5
  
Significant Acquired Intangible Assets
At December 31, 2020, the carrying value of our portfolio of customer relationship intangible assets was $3.08 billion, the principal components of which were as follows:

 a
  
Weighted
Average
Remaining
Amortization
Period
  
 
 
December 31, 2020
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
Basin-specific customer relationships:
                      
   EFS Midstream (acquired 2015)
  
21.4 years
  
$
 1,409.8
  
$
(188.1)
  
$
1,221.7
   State Line and Fairplay (acquired 2010)
  
26.2 years
    
895.0
    
(224.0)
    
671.0
   San Juan Gathering (acquired 2004)
  
18.8 years
    
331.3
    
(245.3)
    
86.0
General customer relationships:
                      
   Oiltanking (acquired 2014)
  
23.0 years
    
1,192.5
    
(162.6)
    
1,029.9

a
  
Weighted
Average
Remaining
Amortization
Period
  
 
 
December 31, 2020
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
Oiltanking customer contracts
  
3.0 years
  
$
293.3
  
$
(261.7)
  
$
31.6
Jonah natural gas gathering agreements
  
21.0 years
    
224.4
    
(175.8)
    
48.6
Delaware Basin natural gas processing contracts
  
6.0 years
    
82.6
    
(23.7)
    
58.9
Schedule of Goodwill

 
  
NGL
Pipelines
& Services
    
Crude Oil
Pipelines
& Services
    
Natural Gas
Pipelines
& Services
    
Petrochemical
& Refined
Products
Services
    
Consolidated
Total
  
Balance at December 31, 2018
  
$
2,651.7
    
$
1,841.0
    
$
296.3
    
$
956.2
    
$
5,745.2
  
                                         
Balance at December 31, 2019
  
$
2,651.7
    
$
1,841.0
    
$
296.3
    
$
956.2
    
$
5,745.2
  
Impairment of goodwill
    
–
      
–
      
(296.3
)
    
–
      
(296.3
)
Balance at December 31, 2020
  
$
2,651.7
    
$
1,841.0
    
$
–
    
$
956.2
    
$
5,448.9