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Intangible Assets and Goodwill (Tables)
 3 Months Ended
Mar. 31, 2013
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, 2013
  
December 31, 2012
 
 
 
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
  
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
 
NGL Pipelines & Services:
 
  
  
  
  
  
 
Customer relationship intangibles
 
$
340.8
  
$
(152.3
)
 
$
188.5
  
$
340.8
  
$
(147.6
)
 
$
193.2
 
Contract-based intangibles
  
284.6
   
(162.1
)
  
122.5
   
284.6
   
(157.2
)
  
127.4
 
Segment total
  
625.4
   
(314.4
)
  
311.0
   
625.4
   
(304.8
)
  
320.6
 
Onshore Natural Gas Pipelines & Services:
                        
Customer relationship intangibles
  
1,163.6
   
(257.8
)
  
905.8
   
1,163.6
   
(250.0
)
  
913.6
 
Contract-based intangibles
  
466.1
   
(316.4
)
  
149.7
   
466.1
   
(311.8
)
  
154.3
 
Segment total
  
1,629.7
   
(574.2
)
  
1,055.5
   
1,629.7
   
(561.8
)
  
1,067.9
 
Onshore Crude Oil Pipelines & Services:
                        
Customer relationship intangibles
  
10.7
   
(5.2
)
  
5.5
   
10.7
   
(4.9
)
  
5.8
 
Contract-based intangibles
  
0.4
   
(0.3
)
  
0.1
   
0.4
   
(0.3
)
  
0.1
 
Segment total
  
11.1
   
(5.5
)
  
5.6
   
11.1
   
(5.2
)
  
5.9
 
Offshore Pipelines & Services:
                        
Customer relationship intangibles
  
203.9
   
(141.6
)
  
62.3
   
203.9
   
(138.5
)
  
65.4
 
Contract-based intangibles
  
1.2
   
(0.4
)
  
0.8
   
1.2
   
(0.4
)
  
0.8
 
Segment total
  
205.1
   
(142.0
)
  
63.1
   
205.1
   
(138.9
)
  
66.2
 
Petrochemical & Refined Products Services:
                        
Customer relationship intangibles
  
104.3
   
(34.7
)
  
69.6
   
104.3
   
(33.4
)
  
70.9
 
Contract-based intangibles
  
39.9
   
(4.9
)
  
35.0
   
41.2
   
(5.9
)
  
35.3
 
Segment total
  
144.2
   
(39.6
)
  
104.6
   
145.5
   
(39.3
)
  
106.2
 
Total all segments
 
$
2,615.5
  
$
(1,075.7
)
 
$
1,539.8
  
$
2,616.8
  
$
(1,050.0
)
 
$
1,566.8
 
Amortization Expense of Intangible Assets by Segment
The following table presents the amortization expense of our intangible assets by business segment for the periods presented:

 
 
For the Three Months
 
 
 
Ended March 31,
 
 
 
2013
  
2012
 
NGL Pipelines & Services
 
$
9.6
  
$
10.2
 
Onshore Natural Gas Pipelines & Services
  
12.4
   
15.8
 
Onshore Crude Oil Pipelines & Services
  
0.3
   
0.2
 
Offshore Pipelines & Services
  
3.0
   
2.6
 
Petrochemical & Refined Products Services
  
1.6
   
3.5
 
Total
 
$
26.9
  
$
32.3
 
Forecasted Amortization Expense
The following table presents our forecast of amortization expense associated with existing intangible assets for the periods indicated:

Remainder
of 2013
  
2014
  
2015
  
2016
  
2017
 
$
79.3
  
$
96.1
  
$
90.1
  
$
91.8
  
$
95.8
 
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 changes in the carrying amount of goodwill during the three months ended March 31, 2013:

 
 
NGL
Pipelines
& Services
  
Onshore
Natural Gas
Pipelines
& Services
  
Onshore
Crude Oil
Pipelines
& Services
  
Offshore
Pipelines
& Services
  
Petrochemical
& Refined
Products
Services
  
Consolidated
Total
 
Balance at December 31, 2012 (1)
 
$
341.2
  
$
296.3
  
$
311.2
  
$
82.1
  
$
1,056.0
  
$
2,086.8
 
Reclassification to assets held for sale
  
--
   
--
   
--
   
--
   
(0.7
)
  
(0.7
)
Balance at March 31, 2013 (1)
 
$
341.2
  
$
296.3
  
$
311.2
  
$
82.1
  
$
1,055.3
  
$
2,086.1
 
 
                        
(1)   The total carrying amount of goodwill at March 31, 2013 and December 31, 2012 is net of $1.3 million of accumulated impairment charges. No goodwill impairment charges were recorded during the three months ended March 31, 2013.