Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Finite-Lived Intangible Assets by Major Class

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

Schedule Of Future Amortization Expense Of Intangible Assets

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