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Other Gains and Losses, Net (Tables)
 12 Months Ended
Dec. 31, 2017
OTHER GAINS AND LOSSES, NET  
Schedule of other gains and losses, net
The components of other gains and losses, net, are as follows:
$ in millions
2017
 
2016
 
2015
Other gains:
 
 
 
 
 
Gain on sale of investments
11.3

 
1.5

 
3.8

Gain on trading investments, net
40.4

 
14.2

 
—

Foreign exchange hedge gain
—

 
22.0

 
—

Gain on contingent consideration liability
7.6

 
—

 
27.1

Net foreign exchange gains

16.2

 
—

 
—

Other realized gains
0.2

 
1.4

 
0.9

Total other gains
75.7

 
39.1

 
31.8

Other losses:
 
 
 
 
 
Other-than-temporary impairment of available-for-sale investments
(3.2
)
 
—

 
(2.0
)
Loss on trading investments, net
—

 
—

 
(13.5
)
Loss on contingent consideration liability
—

 
(7.4
)
 
—

Net foreign exchange losses
—

 
(6.0
)
 
(2.4
)
Foreign exchange hedge loss
(21.0
)
 
—

 
(7.7
)
Realized loss on sale of partnerships
—

 
—

 
(7.3
)
Other realized losses 
—

 
(2.8
)
 
(0.4
)
Total other losses
(24.2
)
 
(16.2
)
 
(33.3
)
Other gains and losses, net
51.5

 
22.9

 
(1.5
)