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Intangible Assets
 12 Months Ended
Dec. 31, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
INTANGIBLE ASSETS
INTANGIBLE ASSETS

The following table presents the major classes of the company's intangible assets at December 31, 2014 and 2013:
$ in millions
Gross Book Value
 
Accumulated Amortization
 
Net Book Value
 
Weighted Average Amortization Period (years)
December 31, 2014
 
 
 
 
 
 
 
Management contracts - indefinite-lived
1,195.9

 
N/A

 
1,195.9

 
N/A
Management contracts - finite-lived
88.8

 
(62.9
)
 
25.9

 
3.5
Customer relationships
40.0

 
(15.2
)
 
24.8

 
8.4
Other
0.8

 
(0.7
)
 
0.1

 
2.8
Total
1,325.5

 
(78.8
)
 
1,246.7

 
 
December 31, 2013
 
 
 
 
 
 
 
Management contracts - indefinite-lived
1,200.0

 
N/A

 
1,200.0

 
N/A
Management contracts - finite-lived
92.1

 
(58.5
)
 
33.6

 
3.5
Customer relationships
40.0

 
(11.9
)
 
28.1

 
8.4
Distribution agreements
17.0

 
(15.2
)
 
1.8

 
4.0
Other
0.8

 
(0.6
)
 
0.2

 
2.8
Total
1,349.9

 
(86.2
)
 
1,263.7

 
 

The 2014 and 2013 annual impairment reviews of indefinite-lived intangible assets determined that no impairment existed at the respective review dates. Amortization expense was $12.6 million during the year ended December 31, 2014 (December 31, 2013: $17.1 million; December 31, 2012: $29.6 million) and is included within General and administrative expenses and Income from discontinued operations, net of taxes 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, 2014 is as follows:
$ in millions

Years Ended December 31,
Estimated Amortization Expense
2015
11.2

2016
11.2

2017
11.1

2018
5.9

2019
3.3