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Goodwill and Acquired Client Relationships - Schedule of changes in goodwill (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Changes in goodwill |  |
Balance at the beginning of the period | $ 2,355.2 | $ 2,117.3
Goodwill acquired | 0 | 225.9
Foreign currency translation | (13.5) | 12.0
Balance at the end of the period | 2,341.7 | 2,355.2
Institutional [Member] |  |
Changes in goodwill |  |
Balance at the beginning of the period | 1,078.5 | 1,071.4
Goodwill acquired | 0 | 0.3
Foreign currency translation | (2.2) | 6.8
Balance at the end of the period | 1,076.3 | 1,078.5
Mutual Fund [Member] |  |
Changes in goodwill |  |
Balance at the beginning of the period | 939.5 | 785.0
Goodwill acquired | 0 | 151.3
Foreign currency translation | (11.4) | 3.2
Balance at the end of the period | 928.1 | 939.5
High Net Worth [Member] |  |
Changes in goodwill |  |
Balance at the beginning of the period | 337.2 | 260.9
Goodwill acquired | 0 | 74.3
Foreign currency translation | 0.1 | 2.0
Balance at the end of the period | $ 337.3 | $ 337.2

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- 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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- 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 + Details
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- Details
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- 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 + Details
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