Related Party Transaction (Tables)

12 Months Ended

Dec. 31, 2012

Related Party Transactions [Abstract]

Schedule of Related Party Transactions [Table Text Block]

	Years ended December 31,
$ in millions	2012	2011	2010
Affiliated operating revenues:
Investment management fees	2,767.5	2,694.3	2,349.0
Service and distribution fees	752.1	779.7	645.0
Performance fees	50.0	33.0	22.1
Other	101.6	128.9	93.3
Total affiliated operating revenues	3,671.2	3,635.9	3,109.4

	As of December 31,
$ in millions	2012	2011
Affiliated asset balances:
Cash equivalents	223.2	257.7
Unsettled fund receivables	131.5	178.8
Accounts receivable	258.3	247.8
Current investments	328.2	248.9
Assets held for policyholders	1,153.2	1,243.1
Other current assets	30.5	22.1
Non-current investments	234.6	184.5
Other non-current assets	2.2	1.9
Total affiliated asset balances	2,361.7	2,384.8
Affiliated liability balances:
Unsettled fund payables	266.0	205.0
Other current liabilities	66.1	63.5
Other non-current liabilities	189.7	191.6
Total affiliated liability balances	521.8	460.1