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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2019
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, 2019 and 2018:
$ in millions
Gross Book Value
 
Accumulated Amortization
 
Net Book Value
December 31, 2019
 
 
 
 
 
Management contracts - indefinite-lived
6,969.1

 
N/A

 
6,969.1

Management contracts - finite-lived
319.3

 
(84.5
)
 
234.8

Developed technology
98.6

 
(31.7
)
 
66.9

Other
112.2

 
(24.7
)
 
87.5

Total
7,499.2

 
(140.9
)
 
7,358.3

December 31, 2018
 
 
 
 
 
Management contracts - indefinite-lived
2,065.0

 
N/A

 
2,065.0

Management contracts - finite-lived
64.3

 
(64.3
)
 

Developed technology
72.3

 
(17.6
)
 
54.7

Other
66.3

 
(9.9
)
 
56.4

Total
2,267.9

 
(91.8
)
 
2,176.1


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, 2019 is as follows:
$ in millions

Years Ended December 31,
Estimated Amortization Expense
2020
(64.4
)
2021
(63.5
)
2022
(60.6
)
2023
(52.6
)
2024
(47.1
)