Investments (Tables)

9 Months Ended

Sep. 30, 2013

Investments [Abstract]

Details of Company Investments

	As of
	September 30,	December 31,
$ in millions	2013	2012
Available-for-sale investments:
Seed money	125.8	113.4
CLOs	2.2	2.4
Other debt securities	6.3	6.3
Trading investments:
Investments related to deferred compensation plans	239.0	213.5
UIT-related equity and debt securities	3.5	4.9
Other equity securities	—	0.3
Equity method investments	292.4	228.2
Foreign time deposits	29.6	31.3
Other	6.2	10.4
Total investments	705.0	610.7

Realized Gains Losses Available-For-Sale Securities

Realized gains and losses recognized in the income statement during the year from investments classified as available-for-sale are as follows:

	For the three months ended September 30, 2013:			For the nine months ended September 30, 2013:
$ in millions	Proceeds from Sales	Gross Realized Gains	Gross Realized Losses	Proceeds from Sales	Gross Realized Gains	Gross Realized Losses
Seed money	0.2	1.0	—	23.1	2.7	(0.3	)
CLOs	0.1	—	—	0.2	—	—

	For the three months ended September 30, 2012:				For the nine months ended September 30, 2012:
$ in millions	Proceeds from Sales	Gross Realized Gains	Gross Realized Losses		Proceeds from Sales	Gross Realized Gains	Gross Realized Losses
Seed money	9.1	1.4	(0.2	)	32.7	3.2	(0.7	)
CLOs	—	—	—		0.2	—	—

Gross Unrealized Holding Gains And Losses Recognized In Other Accumulated Comprehensive Income From Available-For-Sale Investments

Gross unrealized holding gains and losses recognized in other accumulated comprehensive income from available-for-sale investments are presented in the table below:

	September 30, 2013					December 31, 2012
$ in millions	Cost	Gross Unrealized Holding Gains	Gross Unrealized Holding Losses		Fair Value	Cost	Gross Unrealized Holding Gains	Gross Unrealized Holding Losses		Fair Value
Seed money	111.8	14.3	(0.3	)	125.8	105.5	8.4	(0.5	)	113.4
CLOs	2.2	—	—		2.2	2.4	—	—		2.4
Other debt securities	6.3	—	—		6.3	6.3	—	—		6.3
	120.3	14.3	(0.3	)	134.3	114.2	8.4	(0.5	)	122.1

Maturities Of Available-For-Sale Debt Securities

Available-for-sale debt securities by maturity, are set out below:

$ in millions	September 30, 2013
One to five years	1.7
Five to ten years	6.8
Total available-for-sale	8.5

Breakdown Of Available-For-Sale Investments with Unrealized Losses

The following table provides the breakdown of available-for-sale investments with unrealized losses at September 30, 2013:

	Less Than 12 Months			12 Months or Greater			Total
$ in millions	Fair Value	Gross Unrealized Losses		Fair Value	Gross Unrealized Losses		Fair Value	Gross Unrealized Losses
Seed money (41 funds)	11.6	(0.2	)	0.2	(0.1	)	11.8	(0.3	)

The following table provides the breakdown of available-for-sale investments with unrealized losses at December 31, 2012:

	Less Than 12 Months		12 Months or Greater			Total
$ in millions	Fair Value	Gross Unrealized Losses	Fair Value	Gross Unrealized Losses		Fair Value	Gross Unrealized Losses
Seed money (52 funds)	0.2	—	11.5	(0.5	)	11.7	(0.5	)