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Intangible Assets and Goodwill (Tables)
 9 Months Ended
Sep. 30, 2012
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, 2012
  
December 31, 2011
 
 
 
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
  
Gross
Value
  
Accumulated
Amortization
  
Carrying
Value
 
NGL Pipelines & Services:
 
  
  
  
  
  
 
Customer relationship intangibles
 
$
340.8
  
$
(143.0
)
 
$
197.8
  
$
340.8
  
$
(128.2
)
 
$
212.6
 
Contract-based intangibles
  
284.7
   
(152.1
)
  
132.6
   
298.4
   
(169.7
)
  
128.7
 
Segment total
  
625.5
   
(295.1
)
  
330.4
   
639.2
   
(297.9
)
  
341.3
 
Onshore Natural Gas Pipelines & Services:
                        
Customer relationship intangibles
  
1,163.6
   
(240.9
)
  
922.7
   
1,163.6
   
(209.7
)
  
953.9
 
Contract-based intangibles
  
468.3
   
(308.1
)
  
160.2
   
464.8
   
(290.9
)
  
173.9
 
Segment total
  
1,631.9
   
(549.0
)
  
1,082.9
   
1,628.4
   
(500.6
)
  
1,127.8
 
Onshore Crude Oil Pipelines & Services:
                        
Customer relationship intangibles
  
10.1
   
(4.6
)
  
5.5
   
9.7
   
(4.1
)
  
5.6
 
Contract-based intangibles
  
0.4
   
(0.2
)
  
0.2
   
0.4
   
(0.2
)
  
0.2
 
Segment total
  
10.5
   
(4.8
)
  
5.7
   
10.1
   
(4.3
)
  
5.8
 
Offshore Pipelines & Services:
                        
Customer relationship intangibles
  
203.9
   
(135.5
)
  
68.4
   
205.8
   
(129.2
)
  
76.6
 
Contract-based intangibles
  
1.2
   
(0.4
)
  
0.8
   
1.2
   
(0.3
)
  
0.9
 
Segment total
  
205.1
   
(135.9
)
  
69.2
   
207.0
   
(129.5
)
  
77.5
 
Petrochemical & Refined Products Services:
                        
Customer relationship intangibles
  
104.3
   
(32.1
)
  
72.2
   
104.3
   
(28.4
)
  
75.9
 
Contract-based intangibles
  
41.2
   
(5.5
)
  
35.7
   
57.6
   
(29.7
)
  
27.9
 
Segment total
  
145.5
   
(37.6
)
  
107.9
   
161.9
   
(58.1
)
  
103.8
 
Total all segments
 
$
2,618.5
  
$
(1,022.4
)
 
$
1,596.1
  
$
2,646.6
  
$
(990.4
)
 
$
1,656.2
 
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 September 30,
  
For the Nine Months
Ended September 30,
 
 
 
2012
  
2011
  
2012
  
2011
 
NGL Pipelines & Services
 
$
10.1
  
$
10.3
  
$
29.9
  
$
30.7
 
Onshore Natural Gas Pipelines & Services
  
16.8
   
19.5
   
48.4
   
59.6
 
Onshore Crude Oil Pipelines & Services
  
0.2
   
0.1
   
0.5
   
0.3
 
Offshore Pipelines & Services
  
3.1
   
2.8
   
8.3
   
8.6
 
Petrochemical & Refined Products Services
  
2.1
   
4.3
   
8.8
   
12.9
 
Total
 
$
32.3
  
$
37.0
  
$
95.9
  
$
112.1
 
Forecasted Amortization Expense
The following table presents our forecast of amortization expense associated with existing intangible assets for the periods indicated:

Remainder
of 2012
 
 
2013
 
 
2014
 
 
2015
 
 
2016
 
$
28.0
 
 
$
114.6
 
 
$
109.8
 
 
$
108.4
 
 
$
106.8