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Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Goodwill | The following tables present the change in Goodwill and components of Acquired client relationships during the six months ended June 30, 2015:
|  | Goodwill
|  | Institutional |  | Mutual Fund |  | High Net Worth |  | Total
Balance, as of December 31, 2014 |  | $ | 1,159.1 |  |  | $ | 1,125.3 |  |  | $ | 368.4 |  |  | $ | 2,652.8 |
New investments(1) |  | 1.6 |  |  | — |  |  | 27.4 |  |  | 29.0 |
Foreign currency translation |  | (13.3 | ) |  | 10.6 |  |  | (9.1 | ) |  | (11.8 | )
Balance, as of June 30, 2015 |  | $ | 1,147.4 |  |  | $ | 1,135.9 |  |  | $ | 386.7 |  |  | $ | 2,670.0 |
Schedule of Changes in the Components of Acquired Client Relationships |
| Acquired Client Relationships
| Definite-lived |  | Indefinite-lived |  | Total
| Gross Book Value |  | Accumulated Amortization |  | Net Book Value |  | Net Book Value |  | Net Book Value
Balance, as of December 31, 2014 | $ | 1,255.1 |  |  | $ | (565.0 | ) |  | $ | 690.1 |  |  | $ | 1,088.3 |  |  | $ | 1,778.4 |
New investments(1) | 23.6 |  |  | — |  |  | 23.6 |  |  | — |  |  | 23.6 |
Intangible amortization and impairments | — |  |  | (55.9 | ) |  | (55.9 | ) |  | — |  |  | (55.9 | )
Foreign currency translation | (0.1 | ) |  | — |  |  | (0.1 | ) |  | 3.8 |  |  | 3.7 |
Balance, as of June 30, 2015 | $ | 1,278.6 |  |  | $ | (620.9 | ) |  | $ | 657.7 |  |  | $ | 1,092.1 |  |  | $ | 1,749.8 |
__________________________
(1) | On April 1, 2015, the Company completed its investment in Baker Street Advisors, LLC.

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- Definition Tabular disclosure of intangibles assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References No definition available. + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + 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=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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