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Intangible Assets and Goodwill (Tables)
 6 Months Ended
Jun. 30, 2020
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, 2020
    
December 31, 2019
  
 
  
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
    
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
  
NGL Pipelines & Services:
                                    
Customer relationship intangibles
  
$
447.8
    
$
(213.4
)
  
$
234.4
    
$
447.8
    
$
(206.3
)
  
$
241.5
  
Contract-based intangibles
    
162.6
      
(49.6
)
    
113.0
      
162.6
      
(43.9
)
    
118.7
  
Segment total
    
610.4
      
(263.0
)
    
347.4
      
610.4
      
(250.2
)
    
360.2
  
Crude Oil Pipelines & Services:
                                                
Customer relationship intangibles
    
2,203.5
      
(274.8
)
    
1,928.7
      
2,203.5
      
(243.5
)
    
1,960.0
  
Contract-based intangibles
    
283.5
      
(243.4
)
    
40.1
      
276.9
      
(235.0
)
    
41.9
  
Segment total
    
2,487.0
      
(518.2
)
    
1,968.8
      
2,480.4
      
(478.5
)
    
2,001.9
  
Natural Gas Pipelines & Services:
                                                
Customer relationship intangibles
    
1,350.3
      
(497.2
)
    
853.1
      
1,350.3
      
(481.6
)
    
868.7
  
Contract-based intangibles
    
468.0
      
(399.7
)
    
68.3
      
468.0
      
(395.5
)
    
72.5
  
Segment total
    
1,818.3
      
(896.9
)
    
921.4
      
1,818.3
      
(877.1
)
    
941.2
  
Petrochemical & Refined Products Services:
                                                
Customer relationship intangibles
    
181.4
      
(60.7
)
    
120.7
      
181.4
      
(57.5
)
    
123.9
  
Contract-based intangibles
    
46.0
      
(24.9
)
    
21.1
      
46.0
      
(24.2
)
    
21.8
  
Segment total
    
227.4
      
(85.6
)
    
141.8
      
227.4
      
(81.7
)
    
145.7
  
Total intangible assets
  
$
5,143.1
    
$
(1,763.7
)
  
$
3,379.4
    
$
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 periods indicated:

 
  
For the Three Months
Ended June 30,
    
For the Six Months
Ended June 30,
  
 
  
2020
    
2019
    
2020
    
2019
  
NGL Pipelines & Services
  
$
6.3
    
$
9.0
    
$
12.8
    
$
18.1
  
Crude Oil Pipelines & Services
    
18.8
      
24.1
      
39.7
      
46.1
  
Natural Gas Pipelines & Services
    
9.6
      
10.0
      
19.8
      
20.9
  
Petrochemical & Refined Products Services
    
1.9
      
2.2
      
3.9
      
4.4
  
Total
  
$
36.6
    
$
45.3
    
$
76.2
    
$
89.5
  
Forecasted Amortization Expense
The following table presents our forecast of amortization expense associated with existing intangible assets for the periods indicated:

Remainder
of 2020
    
2021
    
2022
    
2023
    
2024
  
$
85.0
    
$
167.6
    
$
164.5
    
$
162.9
    
$
159.3