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Intangible Assets Schedule of changes in goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Goodwill [Roll Forward]
Beginning balance	$ 2,341.7
Goodwill acquired	55.7
Foreign currency translation	(11.5)
Ending balance	2,385.9
Institutional [Member]
Goodwill [Roll Forward]
Beginning balance	1,076.3
Goodwill acquired	20.4
Foreign currency translation	(7.0)
Ending balance	1,089.7
Mutual Fund [Member]
Goodwill [Roll Forward]
Beginning balance	928.1
Goodwill acquired	12.9
Foreign currency translation	(0.1)
Ending balance	940.9
High Net Worth [Member]
Goodwill [Roll Forward]
Beginning balance	337.3
Goodwill acquired	22.4
Foreign currency translation	(4.4)
Ending balance	$ 355.3

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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X

- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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