Consolidated Investment Products (Condensed Consolidating Statement Of Income Line Items Reflecting Impact Of Consolidation Of Investment Products Into The Condensed Consolidated Statements Of Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Total operating revenues	$ 1,269.5	$ 1,112.2
Total operating expenses	1,025.2	845.2
Operating Income (Loss)	244.3	267.0
Equity in earnings of unconsolidated affiliates	10.0	8.1
Interest and dividend income	2.9	2.2
Interest and dividend income of CIP	48.3	50.3
Interest expense of CIP	(30.3)	(32.7)
Other gains/(losses) of CIP, net	26.5	(21.1)
Income from continuing operations before income taxes	297.8	281.8
Income tax provision	(89.0)	(86.3)
Income from continuing operations, net of income taxes	208.8	195.5
Income/(loss) from discontinued operations, net of taxes	(2.0)	4.1
Net income	206.8	199.6
(Gains)/losses attributable to noncontrolling interests in consolidated entities, net	(19.0)	22.6
Net income attributable to common shareholders	187.8	222.2
CLOs - VIEs [Member]
Total operating revenues	0	0
Total operating expenses	17.9	8.5
Operating Income (Loss)	(17.9)	(8.5)
Equity in earnings of unconsolidated affiliates	0	0
Interest and dividend income	0	0
Interest and dividend income of CIP	51.9	53.6
Interest expense of CIP	(34.8)	(37.9)
Other gains/(losses) of CIP, net	(29.2)	(28.5)
Income from continuing operations before income taxes	(30.0)	(21.3)
Income tax provision	0	0
Income from continuing operations, net of income taxes	(30.0)	(21.3)
Income/(loss) from discontinued operations, net of taxes	0	0
Net income	(30.0)	(21.3)
(Gains)/losses attributable to noncontrolling interests in consolidated entities, net	30.3	21.4
Net income attributable to common shareholders	0.3	0.1
Other VIEs [Member]
Total operating revenues	0	0
Total operating expenses	0.3	0.3
Operating Income (Loss)	(0.3)	(0.3)
Equity in earnings of unconsolidated affiliates	0	0
Interest and dividend income	0	0
Interest and dividend income of CIP	0	0
Interest expense of CIP	0	0
Other gains/(losses) of CIP, net	(1.0)	(0.3)
Income from continuing operations before income taxes	(1.3)	(0.6)
Income tax provision	0	0
Income from continuing operations, net of income taxes	(1.3)	(0.6)
Income/(loss) from discontinued operations, net of taxes	0	0
Net income	(1.3)	(0.6)
(Gains)/losses attributable to noncontrolling interests in consolidated entities, net	1.3	0.6
Net income attributable to common shareholders	0	0
VOEs [Member]
Total operating revenues	0	0
Total operating expenses	2.8	2.5
Operating Income (Loss)	(2.8)	(2.5)
Equity in earnings of unconsolidated affiliates	0	0
Interest and dividend income	0	0
Interest and dividend income of CIP	0	0
Interest expense of CIP	0	0
Other gains/(losses) of CIP, net	51.6	4.7
Income from continuing operations before income taxes	48.8	2.2
Income tax provision	0	0
Income from continuing operations, net of income taxes	48.8	2.2
Income/(loss) from discontinued operations, net of taxes	0	0
Net income	48.8	2.2
(Gains)/losses attributable to noncontrolling interests in consolidated entities, net	(47.7)	(1.8)
Net income attributable to common shareholders	1.1	0.4
Adjustments [Member]
Total operating revenues	(8.4)	(8.8)
Total operating expenses	(8.4)	(8.8)
Operating Income (Loss)	0	0
Equity in earnings of unconsolidated affiliates	(1.2)	(0.4)
Interest and dividend income	(0.9)	(1.9)
Interest and dividend income of CIP	(3.6)	(3.3)
Interest expense of CIP	4.5	5.2
Other gains/(losses) of CIP, net	5.1	3.0
Income from continuing operations before income taxes	3.9	2.6
Income tax provision	0	0
Income from continuing operations, net of income taxes	3.9	2.6
Income/(loss) from discontinued operations, net of taxes	0	0
Net income	3.9	2.6
(Gains)/losses attributable to noncontrolling interests in consolidated entities, net	0	0
Net income attributable to common shareholders	3.9	2.6
Impact of CIP [Member]
Total operating revenues	(8.4)	(8.8)
Total operating expenses	12.6	2.5
Operating Income (Loss)	(21.0)	(11.3)
Equity in earnings of unconsolidated affiliates	(1.2)	(0.4)
Interest and dividend income	(0.9)	(1.9)
Interest and dividend income of CIP	48.3	50.3
Interest expense of CIP	(30.3)	(32.7)
Other gains/(losses) of CIP, net	26.5	(21.1)
Income from continuing operations before income taxes	21.4	(17.1)
Income tax provision	0	0
Income from continuing operations, net of income taxes	21.4	(17.1)
Income/(loss) from discontinued operations, net of taxes	0	0
Net income	21.4	(17.1)
(Gains)/losses attributable to noncontrolling interests in consolidated entities, net	(16.1)	20.2
Net income attributable to common shareholders	$ 5.3	$ 3.1