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Intangible Assets and Goodwill (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019
  
December 31, 2018
 
 
 
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
  
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
 
NGL Pipelines & Services:
                  
Customer relationship intangibles
 
$
457.3
  
$
(205.4
)
 
$
251.9
  
$
457.3
  
$
(201.9
)
 
$
255.4
 
Contract-based intangibles
  
363.4
   
(244.3
)
  
119.1
   
363.4
   
(238.7
)
  
124.7
 
Segment total
  
820.7
   
(449.7
)
  
371.0
   
820.7
   
(440.6
)
  
380.1
 
Crude Oil Pipelines & Services:
                        
Customer relationship intangibles
  
2,203.5
   
(189.7
)
  
2,013.8
   
2,203.5
   
(174.1
)
  
2,029.4
 
Contract-based intangibles
  
276.9
   
(218.1
)
  
58.8
   
276.9
   
(211.7
)
  
65.2
 
Segment total
  
2,480.4
   
(407.8
)
  
2,072.6
   
2,480.4
   
(385.8
)
  
2,094.6
 
Natural Gas Pipelines & Services:
                        
Customer relationship intangibles
  
1,350.3
   
(456.9
)
  
893.4
   
1,350.3
   
(447.8
)
  
902.5
 
Contract-based intangibles
  
466.4
   
(389.7
)
  
76.7
   
464.7
   
(387.9
)
  
76.8
 
Segment total
  
1,816.7
   
(846.6
)
  
970.1
   
1,815.0
   
(835.7
)
  
979.3
 
Petrochemical & Refined Products Services:
                        
Customer relationship intangibles
  
181.4
   
(53.2
)
  
128.2
   
181.4
   
(51.8
)
  
129.6
 
Contract-based intangibles
  
46.0
   
(22.0
)
  
24.0
   
46.0
   
(21.2
)
  
24.8
 
Segment total
  
227.4
   
(75.2
)
  
152.2
   
227.4
   
(73.0
)
  
154.4
 
Total intangible assets
 
$
5,345.2
  
$
(1,779.3
)
 
$
3,565.9
  
$
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 March 31,
 
 
 
2019
  
2018
 
NGL Pipelines & Services
 
$
9.1
  
$
7.1
 
Crude Oil Pipelines & Services
  
22.0
   
24.0
 
Natural Gas Pipelines & Services
  
10.9
   
9.7
 
Petrochemical & Refined Products Services
  
2.2
   
2.3
 
Total
 
$
44.2
  
$
43.1
 
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
 
$
124.3
  
$
160.2
  
$
162.4
  
$
168.0
  
$
168.1