Investments (Tables)

6 Months Ended

Jun. 30, 2012

Investments [Abstract]

Details of Company Investments

Current Investments

	As of
	June 30,	December 31,
$ in millions	2012	2011
Available-for-sale investments:
Seed money	109.4	63.5
Trading investments:
Investments related to deferred compensation plans	200.2	184.4
UIT-related equity and debt securities	4.4	3.1
Foreign time deposits	30.0	32.2
Other	0.5	0.5
Total current investments	344.5	283.7

Non-current Investments

	As of
	June 30,	December 31,
$ in millions	2012	2011
Available-for-sale investments:
CLOs	2.5	—
Other debt securities	6.3	—
Equity method investments	198.2	193.1
Other	11.8	7.7
Total non-current investments	218.8	200.8

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 June 30, 2012			For the six months ended June 30, 2012
$ in millions	Proceeds from Sales	Gross Realized Gains	Gross Realized Losses	Proceeds from Sales	Gross Realized Gains	Gross Realized Losses
Current available-for-sale investments	3.3	0.3	—	23.6	1.8	(0.5	)
Non-current available-for-sale investments	0.2	—	—	0.2	—	—

	For the three months ended June 30, 2011				For the six months ended June 30, 2011
$ in millions	Proceeds from Sales	Gross Realized Gains	Gross Realized Losses		Proceeds from Sales	Gross Realized Gains	Gross Realized Losses
Current available-for-sale investments	20.3	3.2	(0.1	)	36.5	6.5	(0.2	)
Non-current available-for-sale investments	—	—	—		0.1	—	—

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:

	June 30, 2012					December 31, 2011
$ in millions	Cost	Gross Unrealized Holding Gains	Gross Unrealized Holding Losses		Fair Value	Cost	Gross Unrealized Holding Gains	Gross Unrealized Holding Losses		Fair Value
Current:
Seed money	108.2	3.2	(2.0	)	109.4	65.7	2.2	(4.4	)	63.5
Current available-for-sale investments	108.2	3.2	(2.0	)	109.4	65.7	2.2	(4.4	)	63.5
Non-current:
CLOs	2.5	—	—		2.5	—	—	—		—
Other debt securities	6.3	—	—		6.3	—	—	—		—
Non-current available-for-sale investments:	8.8	—	—		8.8	—	—	—		—
	117.0	3.2	(2.0	)	118.2	65.7	2.2	(4.4	)	63.5

Maturities Of Available-For-Sale Debt Securities

Available-for-sale debt securities as of June 30, 2012 by maturity, are set out below:

	Available-for-Sale
$ in millions	(Fair Value)
Less than one year	—
One to five years	1.7
Five to ten years	2.5
Greater than ten years	4.6
Total available-for-sale	8.8

Breakdown Of Available-For-Sale Investments with Unrealized Losses

The following table provides the breakdown of available-for-sale investments with unrealized losses at June 30, 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 (37 funds)	14.1	(1.2	)	8.7	(0.8	)	22.8	(2.0	)

The following table provides the breakdown of available-for-sale investments with unrealized losses at December 31, 2011:

	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 (64 funds)	37.5	(4.4	)	—	—	37.5	(4.4	)