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Intangible Assets and Goodwill (Tables)
 12 Months Ended
Dec. 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:

 
  
December 31, 2019
    
December 31, 2018
  
 
  
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
    
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
  
NGL Pipelines & Services:
                                    
Customer relationship intangibles
  
$
447.8
    
$
(206.3
)
  
$
241.5
    
$
457.3
    
$
(201.9
)
  
$
255.4
  
Contract-based intangibles
    
162.6
      
(43.9
)
    
118.7
      
363.4
      
(238.7
)
    
124.7
  
Segment total
    
610.4
      
(250.2
)
    
360.2
      
820.7
      
(440.6
)
    
380.1
  
Crude Oil Pipelines & Services:
                                                
Customer relationship intangibles
    
2,203.5
      
(243.5
)
    
1,960.0
      
2,203.5
      
(174.1
)
    
2,029.4
  
Contract-based intangibles
    
276.9
      
(235.0
)
    
41.9
      
276.9
      
(211.7
)
    
65.2
  
Segment total
    
2,480.4
      
(478.5
)
    
2,001.9
      
2,480.4
      
(385.8
)
    
2,094.6
  
Natural Gas Pipelines & Services:
                                                
Customer relationship intangibles
    
1,350.3
      
(481.6
)
    
868.7
      
1,350.3
      
(447.8
)
    
902.5
  
Contract-based intangibles
    
468.0
      
(395.5
)
    
72.5
      
464.7
      
(387.9
)
    
76.8
  
Segment total
    
1,818.3
      
(877.1
)
    
941.2
      
1,815.0
      
(835.7
)
    
979.3
  
Petrochemical & Refined Products Services:
                                                
Customer relationship intangibles
    
181.4
      
(57.5
)
    
123.9
      
181.4
      
(51.8
)
    
129.6
  
Contract-based intangibles
    
46.0
      
(24.2
)
    
21.8
      
46.0
      
(21.2
)
    
24.8
  
Segment total
    
227.4
      
(81.7
)
    
145.7
      
227.4
      
(73.0
)
    
154.4
  
Total intangible assets
  
$
5,136.5
    
$
(1,687.5
)
  
$
3,449.0
    
$
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 years indicated:

 
  
For the Year Ended December 31,
  
 
  
2019
    
2018
    
2017
  
NGL Pipelines & Services
  
$
31.9
    
$
34.7
    
$
28.9
  
Crude Oil Pipelines & Services
    
92.7
      
87.8
      
92.5
  
Natural Gas Pipelines & Services
    
41.4
      
39.1
      
36.2
  
Petrochemical & Refined Products Services
    
8.7
      
8.7
      
9.3
  
Total
  
$
174.7
    
$
170.3
    
$
166.9
  
Forecasted Amortization Expense
The following table presents our forecast of amortization expense associated with existing intangible assets for the years indicated:

2020
    
2021
    
2022
    
2023
    
2024
  
$
164.8
    
$
167.0
    
$
164.0
    
$
162.4
    
$
158.9
  
Significant Acquired Intangible Assets
At December 31, 2019, the carrying value of our portfolio of customer relationship intangible assets was $3.2 billion, the principal components of which were as follows:

 a
  
Weighted
Average
Remaining
Amortization
Period
  
 
 
December 31, 2019
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
Basin-specific customer relationships:
                      
   EFS Midstream (acquired 2015)
  
22.4 years
  
$
 1,409.8
  
$
(160.1)
  
$
1,249.7
   State Line and Fairplay (acquired 2010)
  
27.2 years
    
895.0
    
(205.1)
    
689.9
   San Juan Gathering (acquired 2004)
  
19.8 years
    
331.3
    
(236.8)
    
94.5
General customer relationships:
                      
   Oiltanking (acquired 2014)
  
24.0 years
    
1,192.5
    
(122.2)
    
1,070.3


a
  
Weighted
Average
Remaining
Amortization
Period
  
 
 
December 31, 2019
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
Oiltanking customer contracts
  
3.6 years
  
$
293.3
  
$
(245.9)
  
$
47.4
Jonah natural gas gathering agreements
  
22.0 years
    
224.4
    
(171.4)
    
53.0
Delaware Basin natural gas processing contracts
  
7.0 years
    
82.6
    
(15.0)
    
67.6