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Intangible Assets and Goodwill (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017
  
December 31, 2016
 
 
 
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
  
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
 
NGL Pipelines & Services:
                  
Customer relationship intangibles
 
$
447.4
  
$
(183.8
)
 
$
263.6
  
$
447.4
  
$
(172.7
)
 
$
274.7
 
Contract-based intangibles
  
279.2
   
(215.1
)
  
64.1
   
279.9
   
(204.4
)
  
75.5
 
Segment total
  
726.6
   
(398.9
)
  
327.7
   
727.3
   
(377.1
)
  
350.2
 
Crude Oil Pipelines & Services:
                        
Customer relationship intangibles
  
2,203.5
   
(114.7
)
  
2,088.8
   
2,204.4
   
(84.5
)
  
2,119.9
 
Contract-based intangibles
  
281.0
   
(158.8
)
  
122.2
   
281.0
   
(121.9
)
  
159.1
 
Segment total
  
2,484.5
   
(273.5
)
  
2,211.0
   
2,485.4
   
(206.4
)
  
2,279.0
 
Natural Gas Pipelines & Services:
                        
Customer relationship intangibles
  
1,350.3
   
(409.5
)
  
940.8
   
1,350.3
   
(390.0
)
  
960.3
 
Contract-based intangibles
  
464.7
   
(377.3
)
  
87.4
   
464.7
   
(370.5
)
  
94.2
 
Segment total
  
1,815.0
   
(786.8
)
  
1,028.2
   
1,815.0
   
(760.5
)
  
1,054.5
 
Petrochemical & Refined Products Services:
                        
Customer relationship intangibles
  
185.5
   
(48.4
)
  
137.1
   
185.5
   
(43.9
)
  
141.6
 
Contract-based intangibles
  
53.5
   
(17.7
)
  
35.8
   
54.0
   
(15.2
)
  
38.8
 
Segment total
  
239.0
   
(66.1
)
  
172.9
   
239.5
   
(59.1
)
  
180.4
 
Total intangible assets
 
$
5,265.1
  
$
(1,525.3
)
 
$
3,739.8
  
$
5,267.2
  
$
(1,403.1
)
 
$
3,864.1
 
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,
 
 
 
2017
  
2016
  
2017
  
2016
 
NGL Pipelines & Services
 
$
7.2
  
$
7.6
  
$
21.8
  
$
23.1
 
Crude Oil Pipelines & Services
  
22.6
   
23.2
   
68.0
   
75.6
 
Natural Gas Pipelines & Services
  
9.3
   
8.1
   
26.3
   
25.0
 
Petrochemical & Refined Products Services
  
2.3
   
2.3
   
7.0
   
6.8
 
Total
 
$
41.4
  
$
41.2
  
$
123.1
  
$
130.5
 
Forecasted Amortization Expense
The following table presents our forecast of amortization expense associated with existing intangible assets for the periods indicated:

Remainder
of 2017
  
2018
  
2019
  
2020
  
2021
 
$
40.8
  
$
163.8
  
$
157.7
  
$
152.8
  
$
163.2