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Intangible Assets
 12 Months Ended
Dec. 31, 2012
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets

The following table presents the major classes of the company's intangible assets at December 31, 2012 and 2011:
$ in millions
Gross Book Value
 
Accumulated Amortization
 
Net Book Value
 
Weighted Average Amortization Period (years)
December 31, 2012
 
 
 
 
 
 
 
Management contracts - indefinite-lived
1,204.1

 
N/A

 
1,204.1

 
N/A
Management contracts - finite-lived
181.0

 
(135.1
)
 
45.9

 
8.7
Customer relationships
40.0

 
(8.6
)
 
31.4

 
12.0
Distribution agreements
17.0

 
(11.0
)
 
6.0

 
4.0
Other
0.8

 
(0.5
)
 
0.3

 
10.0
Total
1,442.9

 
(155.2
)
 
1,287.7

 
9.0
December 31, 2011
 
 
 
 
 
 
 
Management contracts - indefinite-lived
1,206.4

 
N/A

 
1,206.4

 
N/A
Management contracts - finite-lived
185.0

 
(117.0
)
 
68.0

 
8.7
Customer relationships
40.0

 
(5.3
)
 
34.7

 
12.0
Distribution agreements
17.0

 
(6.7
)
 
10.3

 
4.0
Trademarks / Trade names
13.3

 
(10.3
)
 
3.0

 
2.0
Other
0.8

 
(0.4
)
 
0.4

 
10.0
Total
1,462.5

 
(139.7
)
 
1,322.8

 
8.5

Where evidence exists that the underlying arrangements have a high likelihood of continued renewal at little or no cost to the company, the intangible asset is assigned an indefinite life. Indefinite-lived intangible assets primarily relate to management contracts and related rights to manage the assets acquired during prior acquisitions. The 2012 and 2011 annual impairment reviews of indefinite-lived intangible assets determined that no impairment existed at the respective review dates.

Amortization expense was $29.6 million during the year ended December 31, 2012 (December 31, 2011: $42.2 million) and is included within General and Administrative expenses in the Consolidated Statements of Income. Estimated amortization expense for each of the five succeeding fiscal years based upon the company's intangible assets at December 31, 2012 is as follows:
Years Ended December 31,

$ in millions
 
2013
19.0

2014
13.6

2015
11.3

2016
11.2

2017
11.2