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

 
 
June 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
  
$
(180.0
)
 
$
267.4
  
$
447.4
  
$
(172.7
)
 
$
274.7
 
Contract-based intangibles
  
279.9
   
(211.7
)
  
68.2
   
279.9
   
(204.4
)
  
75.5
 
Segment total
  
727.3
   
(391.7
)
  
335.6
   
727.3
   
(377.1
)
  
350.2
 
Crude Oil Pipelines & Services:
                        
Customer relationship intangibles
  
2,203.5
   
(104.4
)
  
2,099.1
   
2,204.4
   
(84.5
)
  
2,119.9
 
Contract-based intangibles
  
281.0
   
(146.5
)
  
134.5
   
281.0
   
(121.9
)
  
159.1
 
Segment total
  
2,484.5
   
(250.9
)
  
2,233.6
   
2,485.4
   
(206.4
)
  
2,279.0
 
Natural Gas Pipelines & Services:
                        
Customer relationship intangibles
  
1,350.3
   
(402.5
)
  
947.8
   
1,350.3
   
(390.0
)
  
960.3
 
Contract-based intangibles
  
464.7
   
(375.0
)
  
89.7
   
464.7
   
(370.5
)
  
94.2
 
Segment total
  
1,815.0
   
(777.5
)
  
1,037.5
   
1,815.0
   
(760.5
)
  
1,054.5
 
Petrochemical & Refined Products Services:
                        
Customer relationship intangibles
  
185.5
   
(46.9
)
  
138.6
   
185.5
   
(43.9
)
  
141.6
 
Contract-based intangibles
  
54.0
   
(16.9
)
  
37.1
   
54.0
   
(15.2
)
  
38.8
 
Segment total
  
239.5
   
(63.8
)
  
175.7
   
239.5
   
(59.1
)
  
180.4
 
Total intangible assets
 
$
5,266.3
  
$
(1,483.9
)
 
$
3,782.4
  
$
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 June 30,
  
For the Six Months
Ended June 30,
 
 
 
2017
  
2016
  
2017
  
2016
 
NGL Pipelines & Services
 
$
7.3
  
$
7.7
  
$
14.6
  
$
15.5
 
Crude Oil Pipelines & Services
  
22.3
   
24.7
   
45.4
   
52.4
 
Natural Gas Pipelines & Services
  
8.8
   
8.3
   
17.0
   
16.9
 
Petrochemical & Refined Products Services
  
2.3
   
2.3
   
4.7
   
4.5
 
Total
 
$
40.7
  
$
43.0
  
$
81.7
  
$
89.3
 
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
 
$
81.1
  
$
163.8
  
$
157.7
  
$
152.8
  
$
163.2