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Intangible Assets and Goodwill (Tables)
 6 Months Ended
Jun. 30, 2013
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, 2013
December 31, 2012
 
Gross
Value
Accumulated
Amortization
Carrying
Value
Gross
Value
Accumulated
Amortization
Carrying
Value
NGL Pipelines & Services:
Customer relationship intangibles
$
340.8
$
(156.8
)
$
184.0
$
340.8
$
(147.6
)
$
193.2
Contract-based intangibles
 
280.3
 
(162.8
)
 
117.5
 
284.6
 
(157.2
)
 
127.4
Segment total
 
621.1
 
(319.6
)
 
301.5
 
625.4
 
(304.8
)
 
320.6
Onshore Natural Gas Pipelines & Services:
Customer relationship intangibles
1,163.6
(265.3
)
898.3
1,163.6
(250.0
)
913.6
Contract-based intangibles
 
466.1
 
(321.2
)
 
144.9
 
466.1
 
(311.8
)
 
154.3
Segment total
 
1,629.7
 
(586.5
)
 
1,043.2
 
1,629.7
 
(561.8
)
 
1,067.9
Onshore Crude Oil Pipelines & Services:
Customer relationship intangibles
10.7
(5.6
)
5.1
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
 
(5.9
)
 
5.2
 
11.1
 
(5.2
)
 
5.9
Offshore Pipelines & Services:
Customer relationship intangibles
203.9
(144.5
)
59.4
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
 
(144.9
)
 
60.2
 
205.1
 
(138.9
)
 
66.2
Petrochemical & Refined Products Services:
Customer relationship intangibles
104.3
(35.9
)
68.4
104.3
(33.4
)
70.9
Contract-based intangibles
 
39.9
 
(5.2
)
 
34.7
 
41.2
 
(5.9
)
 
35.3
Segment total
 
144.2
 
(41.1
)
 
103.1
 
145.5
 
(39.3
)
 
106.2
Total all segments
$
2,611.2
$
(1,098.0
)
$
1,513.2
$
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 indicated:

 
 
For the Three Months
Ended June 30,
 
 
For the Six Months
Ended June 30,
 
 
 
2013
 
 
2012
 
 
2013
 
 
2012
 
NGL Pipelines & Services
 
$
9.5
 
 
$
9.6
 
 
$
19.1
 
 
$
19.8
 
Onshore Natural Gas Pipelines & Services
 
 
12.3
 
 
 
15.8
 
 
 
24.7
 
 
 
31.6
 
Onshore Crude Oil Pipelines & Services
 
 
0.4
 
 
 
0.1
 
 
 
0.7
 
 
 
0.3
 
Offshore Pipelines & Services
 
 
2.9
 
 
 
2.6
 
 
 
5.9
 
 
 
5.2
 
Petrochemical & Refined Products Services
 
 
1.6
 
 
 
3.2
 
 
 
3.2
 
 
 
6.7
 
Total
 
$
26.7
 
 
$
31.3
 
 
$
53.6
 
 
$
63.6
 
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
 
$
51.7
 
 
$
96.2
 
 
$
90.3
 
 
$
92.0
 
 
$
96.0
 
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 six months ended June 30, 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
Goodwill related to the sale of assets
 
--
 
--
 
(6.1
)
 
--
 
(0.7
)
 
(6.8
)
Balance at June 30, 2013 (1)
$
341.2
$
296.3
$
305.1
$
82.1
$
1,055.3
$
2,080.0
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(1)   The total carrying amount of goodwill at June 30, 2013 and December 31, 2012 is net of $1.3 million of accumulated impairment charges. No goodwill impairment charges were recorded during the six months ended June 30, 2013.