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Intangible Assets and Goodwill
 6 Months Ended
Jun. 30, 2019
Intangible Assets and Goodwill [Abstract]  
Intangible Assets and Goodwill
Note 6.  Intangible Assets and Goodwill

Identifiable Intangible Assets

The following table summarizes our intangible assets by business segment at the dates indicated:

 
  
June 30, 2019
    
December 31, 2018
  
 
  
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
    
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
  
NGL Pipelines & Services:
                                    
Customer relationship intangibles
  
$
447.8
    
$
(199.3
)
  
$
248.5
    
$
457.3
    
$
(201.9
)
  
$
255.4
  
Contract-based intangibles
    
375.4
      
(249.9
)
    
125.5
      
363.4
      
(238.7
)
    
124.7
  
Segment total
    
823.2
      
(449.2
)
    
374.0
      
820.7
      
(440.6
)
    
380.1
  
Crude Oil Pipelines & Services:
                                                
Customer relationship intangibles
    
2,203.5
      
(207.7
)
    
1,995.8
      
2,203.5
      
(174.1
)
    
2,029.4
  
Contract-based intangibles
    
276.9
      
(224.2
)
    
52.7
      
276.9
      
(211.7
)
    
65.2
  
Segment total
    
2,480.4
      
(431.9
)
    
2,048.5
      
2,480.4
      
(385.8
)
    
2,094.6
  
Natural Gas Pipelines & Services:
                                                
Customer relationship intangibles
    
1,350.3
      
(464.9
)
    
885.4
      
1,350.3
      
(447.8
)
    
902.5
  
Contract-based intangibles
    
466.4
      
(391.7
)
    
74.7
      
464.7
      
(387.9
)
    
76.8
  
Segment total
    
1,816.7
      
(856.6
)
    
960.1
      
1,815.0
      
(835.7
)
    
979.3
  
Petrochemical & Refined Products Services:
                                                
Customer relationship intangibles
    
181.4
      
(54.8
)
    
126.6
      
181.4
      
(51.8
)
    
129.6
  
Contract-based intangibles
    
46.0
      
(22.6
)
    
23.4
      
46.0
      
(21.2
)
    
24.8
  
Segment total
    
227.4
      
(77.4
)
    
150.0
      
227.4
      
(73.0
)
    
154.4
  
Total intangible assets
  
$
5,347.7
    
$
(1,815.1
)
  
$
3,532.6
    
$
5,343.5
    
$
(1,735.1
)
  
$
3,608.4
  
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,
  
 
  
2019
    
2018
    
2019
    
2018
  
NGL Pipelines & Services
  
$
9.0
    
$
9.3
    
$
18.1
    
$
16.4
  
Crude Oil Pipelines & Services
    
24.1
      
22.6
      
46.1
      
46.6
  
Natural Gas Pipelines & Services
    
10.0
      
9.6
      
20.9
      
19.3
  
Petrochemical & Refined Products Services
    
2.2
      
2.1
      
4.4
      
4.4
  
Total
  
$
45.3
    
$
43.6
    
$
89.5
    
$
86.7
  
The following table presents our forecast of amortization expense associated with existing intangible assets for the periods indicated:

Remainder
of 2019
    
2020
    
2021
    
2022
    
2023
  
$
82.1
    
$
160.5
    
$
162.8
    
$
168.4
    
$
168.5
  

Goodwill

Goodwill represents the excess of the purchase price of an acquired business over the amounts assigned to assets acquired and liabilities assumed in the transaction.  There has been no change in our goodwill amounts since those reported in our 2018 Form 10-K.