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Intangible Assets and Goodwill (Tables)
 6 Months Ended
Jun. 30, 2019
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, 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
  
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,
  
 
  
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
  
Forecasted Amortization Expense
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