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Intangible Assets and Goodwill (Tables)
 9 Months Ended
Sep. 30, 2018
Intangible Assets and Goodwill [Abstract]  
Intangible Assets by Segment
The following table summarizes our intangible assets by business segment at the dates indicated:

 
 
September 30, 2018
  
December 31, 2017
 
 
 
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
  
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
 
NGL Pipelines & Services:
                  
Customer relationship intangibles
 
$
457.3
  
$
(198.4
)
 
$
258.9
  
$
447.4
  
$
(187.5
)
 
$
259.9
 
Contract-based intangibles
  
363.4
   
(233.1
)
  
130.3
   
280.8
   
(218.4
)
  
62.4
 
Segment total
  
820.7
   
(431.5
)
  
389.2
   
728.2
   
(405.9
)
  
322.3
 
Crude Oil Pipelines & Services:
                        
Customer relationship intangibles
  
2,203.5
   
(161.8
)
  
2,041.7
   
2,203.5
   
(127.0
)
  
2,076.5
 
Contract-based intangibles
  
281.0
   
(203.5
)
  
77.5
   
281.0
   
(171.0
)
  
110.0
 
Segment total
  
2,484.5
   
(365.3
)
  
2,119.2
   
2,484.5
   
(298.0
)
  
2,186.5
 
Natural Gas Pipelines & Services:
                        
Customer relationship intangibles
  
1,350.3
   
(439.9
)
  
910.4
   
1,350.3
   
(417.1
)
  
933.2
 
Contract-based intangibles
  
464.7
   
(385.8
)
  
78.9
   
464.7
   
(379.5
)
  
85.2
 
Segment total
  
1,815.0
   
(825.7
)
  
989.3
   
1,815.0
   
(796.6
)
  
1,018.4
 
Petrochemical & Refined Products Services:
                        
Customer relationship intangibles
  
181.4
   
(50.3
)
  
131.1
   
181.4
   
(45.9
)
  
135.5
 
Contract-based intangibles
  
46.0
   
(20.6
)
  
25.4
   
46.0
   
(18.4
)
  
27.6
 
Segment total
  
227.4
   
(70.9
)
  
156.5
   
227.4
   
(64.3
)
  
163.1
 
Total intangible assets
 
$
5,347.6
  
$
(1,693.4
)
 
$
3,654.2
  
$
5,255.1
  
$
(1,564.8
)
 
$
3,690.3
 
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 September 30,
  
For the Nine Months
Ended September 30,
 
 
 
2018
  
2017
  
2018
  
2017
 
NGL Pipelines & Services
 
$
9.2
  
$
7.2
  
$
25.6
  
$
21.8
 
Crude Oil Pipelines & Services
  
20.7
   
22.6
   
67.3
   
68.0
 
Natural Gas Pipelines & Services
  
9.8
   
9.3
   
29.1
   
26.3
 
Petrochemical & Refined Products Services
  
2.2
   
2.3
   
6.6
   
7.0
 
Total
 
$
41.9
  
$
41.4
  
$
128.6
  
$
123.1
 
Forecasted Amortization Expense
The following table presents our forecast of amortization expense associated with existing intangible assets for the periods indicated:

Remainder
of 2018
  
2019
  
2020
  
2021
  
2022
 
$
36.8
  
$
151.7
  
$
140.7
  
$
148.4
  
$
144.6