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Intangible Assets and Goodwill (Tables)
 6 Months Ended
Jun. 30, 2021
Intangible Assets and Goodwill [Abstract]  
Intangible Assets by Segment
The following table summarizes our intangible assets by business segment at the dates indicated:

   
June 30, 2021
    
December 31, 2020
  
 
  
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
    
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
  
NGL Pipelines & Services:
                                    
Customer relationship intangibles
  
$
447.8
    
$
(227.9
)
  
$
219.9
    
$
447.8
    
$
(221.3
)
  
$
226.5
  
Contract-based intangibles
    
166.0
      
(56.5
)
    
109.5
      
162.6
      
(55.0
)
    
107.6
  
Segment total
    
613.8
      
(284.4
)
    
329.4
      
610.4
      
(276.3
)
    
334.1
  
Crude Oil Pipelines & Services:
                                                
Customer relationship intangibles
    
2,195.0
      
(322.1
)
    
1,872.9
      
2,195.0
      
(291.6
)
    
1,903.4
  
Contract-based intangibles
    
283.1
      
(256.3
)
    
26.8
      
283.1
      
(249.9
)
    
33.2
  
Segment total
    
2,478.1
      
(578.4
)
    
1,899.7
      
2,478.1
      
(541.5
)
    
1,936.6
  
Natural Gas Pipelines & Services:
                                                
Customer relationship intangibles
    
1,350.3
      
(530.6
)
    
819.7
      
1,350.3
      
(512.2
)
    
838.1
  
Contract-based intangibles
    
231.1
      
(180.2
)
    
50.9
      
470.7
      
(403.8
)
    
66.9
  
Segment total
    
1,581.4
      
(710.8
)
    
870.6
      
1,821.0
      
(916.0
)
    
905.0
  
Petrochemical & Refined Products Services:
                                                
Customer relationship intangibles
    
181.4
      
(71.1
)
    
110.3
      
181.4
      
(68.3
)
    
113.1
  
Contract-based intangibles
    
44.9
      
(25.2
)
    
19.7
      
44.9
      
(24.6
)
    
20.3
  
Segment total
    
226.3
      
(96.3
)
    
130.0
      
226.3
      
(92.9
)
    
133.4
  
Total intangible assets
  
$
4,899.6
    
$
(1,669.9
)
  
$
3,229.7
    
$
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 June 30,
    
For the Six Months
Ended June 30,
  
 
  
2021
    
2020
    
2021
    
2020
  
NGL Pipelines & Services
  
$
6.1
    
$
6.3
    
$
12.1
    
$
12.8
  
Crude Oil Pipelines & Services
    
19.1
      
18.8
      
36.9
      
39.7
  
Natural Gas Pipelines & Services
    
10.6
      
9.6
      
21.2
      
19.8
  
Petrochemical & Refined Products Services
    
1.7
      
1.9
      
3.4
      
3.9
  
Total
  
$
37.5
    
$
36.6
    
$
73.6
    
$
76.2
  
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
  
$
73.0
    
$
160.3
    
$
168.1
    
$
164.4
    
$
162.9