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Intangible Assets and Goodwill (Tables)
 6 Months Ended
Jun. 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:

 
 
June 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
  
$
(194.8
)
 
$
262.5
  
$
447.4
  
$
(187.5
)
 
$
259.9
 
Contract-based intangibles
  
363.4
   
(227.5
)
  
135.9
   
280.8
   
(218.4
)
  
62.4
 
Segment total
  
820.7
   
(422.3
)
  
398.4
   
728.2
   
(405.9
)
  
322.3
 
Crude Oil Pipelines & Services:
                        
Customer relationship intangibles
  
2,203.5
   
(151.0
)
  
2,052.5
   
2,203.5
   
(127.0
)
  
2,076.5
 
Contract-based intangibles
  
281.0
   
(193.6
)
  
87.4
   
281.0
   
(171.0
)
  
110.0
 
Segment total
  
2,484.5
   
(344.6
)
  
2,139.9
   
2,484.5
   
(298.0
)
  
2,186.5
 
Natural Gas Pipelines & Services:
                        
Customer relationship intangibles
  
1,350.3
   
(432.1
)
  
918.2
   
1,350.3
   
(417.1
)
  
933.2
 
Contract-based intangibles
  
464.7
   
(383.8
)
  
80.9
   
464.7
   
(379.5
)
  
85.2
 
Segment total
  
1,815.0
   
(815.9
)
  
999.1
   
1,815.0
   
(796.6
)
  
1,018.4
 
Petrochemical & Refined Products Services:
                        
Customer relationship intangibles
  
181.4
   
(48.8
)
  
132.6
   
181.4
   
(45.9
)
  
135.5
 
Contract-based intangibles
  
46.0
   
(19.9
)
  
26.1
   
46.0
   
(18.4
)
  
27.6
 
Segment total
  
227.4
   
(68.7
)
  
158.7
   
227.4
   
(64.3
)
  
163.1
 
Total intangible assets
 
$
5,347.6
  
$
(1,651.5
)
 
$
3,696.1
  
$
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 June 30,
  
For the Six Months
Ended June 30,
 
 
 
2018
  
2017
  
2018
  
2017
 
NGL Pipelines & Services
 
$
9.3
  
$
7.3
  
$
16.4
  
$
14.6
 
Crude Oil Pipelines & Services
  
22.6
   
22.3
   
46.6
   
45.4
 
Natural Gas Pipelines & Services
  
9.6
   
8.8
   
19.3
   
17.0
 
Petrochemical & Refined Products Services
  
2.1
   
2.3
   
4.4
   
4.7
 
Total
 
$
43.6
  
$
40.7
  
$
86.7
  
$
81.7
 
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
 
$
75.8
  
$
151.7
  
$
140.7
  
$
148.4
  
$
144.6