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Intangible Assets and Goodwill (Tables)
 3 Months Ended
Mar. 31, 2021
Intangible Assets and Goodwill [Abstract]  
Intangible Assets by Segment
The following table summarizes our intangible assets by business segment at the dates indicated:

   
March 31, 2021
    
December 31, 2020
  
 
  
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
    
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
  
NGL Pipelines & Services:
                                    
Customer relationship intangibles
  
$
447.8
    
$
(224.5
)
  
$
223.3
    
$
447.8
    
$
(221.3
)
  
$
226.5
  
Contract-based intangibles
    
162.6
      
(57.8
)
    
104.8
      
162.6
      
(55.0
)
    
107.6
  
Segment total
    
610.4
      
(282.3
)
    
328.1
      
610.4
      
(276.3
)
    
334.1
  
Crude Oil Pipelines & Services:
                                                
Customer relationship intangibles
    
2,195.0
      
(306.1
)
    
1,888.9
      
2,195.0
      
(291.6
)
    
1,903.4
  
Contract-based intangibles
    
283.1
      
(253.2
)
    
29.9
      
283.1
      
(249.9
)
    
33.2
  
Segment total
    
2,478.1
      
(559.3
)
    
1,918.8
      
2,478.1
      
(541.5
)
    
1,936.6
  
Natural Gas Pipelines & Services:
                                                
Customer relationship intangibles
    
1,350.3
      
(521.1
)
    
829.2
      
1,350.3
      
(512.2
)
    
838.1
  
Contract-based intangibles
    
231.1
      
(179.1
)
    
52.0
      
470.7
      
(403.8
)
    
66.9
  
Segment total
    
1,581.4
      
(700.2
)
    
881.2
      
1,821.0
      
(916.0
)
    
905.0
  
Petrochemical & Refined Products Services:
                                                
Customer relationship intangibles
    
181.4
      
(69.7
)
    
111.7
      
181.4
      
(68.3
)
    
113.1
  
Contract-based intangibles
    
44.9
      
(24.9
)
    
20.0
      
44.9
      
(24.6
)
    
20.3
  
Segment total
    
226.3
      
(94.6
)
    
131.7
      
226.3
      
(92.9
)
    
133.4
  
Total intangible assets
  
$
4,896.2
    
$
(1,636.4
)
  
$
3,259.8
    
$
5,135.8
    
$
(1,826.7
)
  
$
3,309.1
  
Amortization Expense of Intangible Assets by Segment
The following table presents the amortization expense of our intangible assets by business segment for the periods indicated:

 
  
For the Three Months
Ended March 31,
  
 
  
2021
    
2020
  
NGL Pipelines & Services
  
$
6.0
    
$
6.5
  
Crude Oil Pipelines & Services
    
17.8
      
20.9
  
Natural Gas Pipelines & Services
    
10.6
      
10.2
  
Petrochemical & Refined Products Services
    
1.7
      
2.0
  
Total
  
$
36.1
    
$
39.6
  
Forecasted Amortization Expense
The following table presents our forecast of amortization expense associated with existing intangible assets for the periods indicated:

Remainder
of 2021
    
2022
    
2023
    
2024
    
2025
  
$
107.9
    
$
159.5
    
$
167.4
    
$
163.6
    
$
162.2