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Intangible Assets and Goodwill (Tables)
 3 Months Ended
Mar. 31, 2017
Intangible Assets and Goodwill [Abstract]  
Intangible Assets by Segment
The following table summarizes our intangible assets by business segment at the dates indicated:

 
 
March 31, 2017
  
December 31, 2016
 
 
 
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
  
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
 
NGL Pipelines & Services:
                  
Customer relationship intangibles
 
$
447.4
  
$
(176.4
)
 
$
271.0
  
$
447.4
  
$
(172.7
)
 
$
274.7
 
Contract-based intangibles
  
279.9
   
(208.0
)
  
71.9
   
279.9
   
(204.4
)
  
75.5
 
Segment total
  
727.3
   
(384.4
)
  
342.9
   
727.3
   
(377.1
)
  
350.2
 
Crude Oil Pipelines & Services:
                        
Customer relationship intangibles
  
2,204.4
   
(95.2
)
  
2,109.2
   
2,204.4
   
(84.5
)
  
2,119.9
 
Contract-based intangibles
  
281.0
   
(134.3
)
  
146.7
   
281.0
   
(121.9
)
  
159.1
 
Segment total
  
2,485.4
   
(229.5
)
  
2,255.9
   
2,485.4
   
(206.4
)
  
2,279.0
 
Natural Gas Pipelines & Services:
                        
Customer relationship intangibles
  
1,350.3
   
(396.0
)
  
954.3
   
1,350.3
   
(390.0
)
  
960.3
 
Contract-based intangibles
  
464.7
   
(372.7
)
  
92.0
   
464.7
   
(370.5
)
  
94.2
 
Segment total
  
1,815.0
   
(768.7
)
  
1,046.3
   
1,815.0
   
(760.5
)
  
1,054.5
 
Petrochemical & Refined Products Services:
                        
Customer relationship intangibles
  
185.5
   
(45.5
)
  
140.0
   
185.5
   
(43.9
)
  
141.6
 
Contract-based intangibles
  
54.0
   
(16.0
)
  
38.0
   
54.0
   
(15.2
)
  
38.8
 
Segment total
  
239.5
   
(61.5
)
  
178.0
   
239.5
   
(59.1
)
  
180.4
 
Total intangible assets
 
$
5,267.2
  
$
(1,444.1
)
 
$
3,823.1
  
$
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 March 31,
 
 
 
2017
  
2016
 
NGL Pipelines & Services
 
$
7.3
  
$
7.8
 
Crude Oil Pipelines & Services
  
23.1
   
27.7
 
Natural Gas Pipelines & Services
  
8.2
   
8.6
 
Petrochemical & Refined Products Services
  
2.4
   
2.2
 
Total
 
$
41.0
  
$
46.3
 
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
 
$
121.1
  
$
163.8
  
$
157.7
  
$
152.8
  
$
163.2
 
Changes in Carrying Amount of Goodwill
Goodwill represents the excess of the purchase price of an acquired business over the amounts assigned to assets acquired and liabilities assumed in the transaction.  The following table presents the carrying amount of goodwill at the dates indicated:

 
 
NGL
Pipelines
& Services
  
Crude Oil
Pipelines
& Services
  
Natural Gas
Pipelines
& Services
  
Petrochemical
& Refined
Products
Services
  
Consolidated
Total
 
Balance at December 31, 2016
 
$
2,651.7
  
$
1,841.0
  
$
296.3
  
$
956.2
  
$
5,745.2
 
Balance at March 31, 2017
 
$
2,651.7
  
$
1,841.0
  
$
296.3
  
$
956.2
  
$
5,745.2